Office Casual Styling for Men in Their 30s! 5 recommendations

When you enter your 30s, people around you start to look at you differently, both at work and in your personal life.

Especially in business situations, clean and trustworthy attire will be required. This article provides a thorough explanation of office casual styling techniques for men in their 30s, incorporating the spring 2025 trends.

We will introduce key points and recommended items for coordination that will allow you to express your personality while achieving a good impression in the workplace.

What are the key points to keep in mind when styling office casual for men in their 30s?

The most important aspect of office casual wear for men in their 30s is to strike a balance between "mature composure" and "appropriate formality.

It should not be too casual like the style of men in their 20s, but not too formal either. In spring office casual wear in particular, the key is to maintain a sense of cleanliness and dignity appropriate for the business scene while incorporating a sense of the season.

The basis of office casual wear is a balance between "neatness" and "coziness. To create a sense of neatness, it is important to choose items that are appropriately sized and that give a clean impression without wrinkles or sagging. This is because a disheveled impression may also call into question one's attitude toward work. Specifically, jackets and shirts should fit the lines of the body, and the hem of pants should be adjusted to a length that does not touch the floor.

To create a cozy look, it is important to coordinate the entire body in a well-balanced manner. For example, if you wear a navy jacket as a top, wear beige or gray pants as bottoms,COLORFor example, if you wear a navy jacket as a top, wear beige or gray pants as bottoms. It is also effective to use accessories that make a difference. Accessories such as a good quality belt or watch can subtly show off your good taste.

Material selection is also an important factor in spring office casual wear. Spring is a season of large temperature changes, so choose natural fabrics such as cotton, linen, and lightweight wool, which have excellent temperature control properties and are comfortable to wear. These materials also have the advantage of being breathable and do not become stuffy when sweating.

For men in their 30s, office casual is more than just a dress code; it is a way to express one's career and personality. While keeping the basics in mind, you can also choose items that incorporate trends and your own personal style.COLORand patterns that are unique to you, while keeping the basics in mind.

Office Casual for Spring, Standard Items and How to Wear Them

To succeed in spring office casual wear, it is important to know the standard items with a seasonal feel and to combine them appropriately.

By wearing basic items such as jackets, knits and shirts in a spring-like manner, you can achieve both a clean and trendy look.

Increase the variety of your outfits for different occasions and enjoy coordinating your outfits every day.

 

Get a good impression with a clean jacket style

The standard office casual wear for spring is the jacket style.

For men in their 30s in particular, we recommend "clean jackets" that are not too casual or too formal. The reason why jackets are so important is that they instantly give the impression of a man who can get the job done.

Recommended jacket materials for spring are lightweight and breathable cotton, linen, or blends of these materials.COLORAs for taste, navy, beige, light gray, and other bright spring-like colors are recommended.COLORnavy, beige, light gray, etc., will give a sense of the season. TheseCOLORare easy to match with a variety of innerwear, and have the advantage of broadening the range of coordination.

In addition to wearing the jacket with a shirt as an inner layer, it is also recommended to layer a cut-and-sewn or polo shirt. For example, wearing a white T-shirt under a navy jacket and beige chinos as bottoms will give a casual yet classy impression.

A specific example of coordination would be a light blue linen-blend jacket that evokes the freshness of spring, with a white shirt and navy chinos. On the feet, brownCOLORon your feet with brown loafers, you will have a coordinated look that combines the lightness of spring with the calmness of an adult.

Office casual with a casual look created with spring knitwear

Spring knits" are particularly useful in spring office casual wear.

In early spring, when there are many chilly days, knits that are both warm and light in appearance are very useful. The reason why spring knits are good is that they can create a relaxed, cozy atmosphere while giving a formal impression.

Recommended knit materials for spring are lightweight, breathable cottons, linens, and silk blends. Instead of thick wool knits, choose those that are moderately thin and lightweight.COLORAs for taste, spring colors such as gray, beige, light blue, and mint green are recommended.

The standard way to wear spring knits is to wear a V-neck knit with a shirt in a layered style. By neatly pulling the collar of the shirt out of the knit and adding a tie if necessary, this style can be used for a wide range of situations, from casual to business. Crew-neck knitwear can also be worn by itself, depending on the material andCOLORYou can also express a sense of the season by using a crew-neck knit by itself.

For example, a light gray V-neck knit, white shirt, and navy slacks is a classic spring office casual outfit. Brown on the feetCOLORsuede loafers to add a soft, spring-like impression. Combined with a jacket, it can also be worn for more formal occasions.

Simple and smart style with shirt and slacks

The basic office casual style, and the simplest to coordinate, is the "shirt and slacks" style.

At first glance, it may look simple, but it is easy to see the difference in the materials and the way they are worn.COLORand accessories can create an impression of sophistication. The reason why this style is so effective is that it naturally creates a sense of cleanliness and trust.

Shirts recommended for spring are made of oxford, broadcloth, and linen. Shirts made of linen blends, in particular, can combine the lightness of spring with a moderate casual feel.COLORAs for taste, try to incorporate not only the standard white and blue, but also spring-like pastel colors such as pale pink, mint green, and lavender.

For slacks, wool-blend or cotton fabrics are recommended. Spring-likeCOLORAs for taste, navy, gray, and beige are easy to use and match with a variety of tops. Especially for men in their 30s, a tapered silhouette with a bit of room gives a cozy look.

The key to dressing shirt and slacks is how to create a "loose" look. For example, unbutton the first button of the shirt, roll up the sleeves, or use a belt or shoes.COLORto achieve an exquisite balance between casual and formal.

As a specific example of coordination, a light blue linen-blend shirt with navy slacks and a brown belt or shoes.COLORA brown leather belt and loafers will create a sense of unity. This alone is smart enough, but on chilly days, a navy jacket or beige cardigan can be added to create a more mature and relaxed impression.

Five recommended office casual outfits

For men in their 30s, here are five spring office casual coordinates that are actually easy to adopt.

All of these coordinates are clean and make a good impression in the workplace, yet are trendy and in season. Please refer to them according to your own body shape and preferences. We also recommend that you arrange them to match the atmosphere of your workplace.

Coordinate 1: Fresh blue color makes a good impression! A classic spring jacket style

This fresh blue jacket style is representative of spring office casual wear. From light blue to medium blue to navy, blue jackets are a spring staple. The reason why this style makes a good impression is that blueCOLORhas the psychological effect of making you feel sincere and trustworthy.

Specifically, a light blue cotton-linen blend jacket is worn with a white oxford shirt and beige chinos. On the feet, a brownCOLORsuede loafers for a light, spring-like impression. The key to this style is the material of the jacket andCOLORand the use of the material of the jacket expresses the spring season.

For accessories, a simple watch and a pocket chief slightly visible in the inside pocket of the jacket will give a subtle playful and mature impression. For example, a pocket chief with a small dot pattern on a white background strikes the perfect balance between being neither too casual nor too formal.

This coordinate is a versatile style that can be used for more formal business situations, such as meetings and in-house conferences. On a chilly day, a similarCOLORknit under the shirt on chilly days.

Coordinate 2: Adult casual cardigan style

The cardigan style is more relaxed than the jacket style, but can also be worn neatly.

Cardigans are especially useful in spring, when the temperature can be easily adjusted. The reason why cardigans are suitable for casual office wear in spring is that they are somewhere between formal and casual and can be smoothly switched on and off.

To coordinate specifically, a navy V-neck cardigan is worn with a white shirt and gray slacks. Black or dark brown on the footwear.COLORleather shoes to express the calmness of an adult. The material of the cardigan should be light and spring-like, such as cotton or linen blend.

The charm of this style lies in the fact that you can easily change your look by simply taking the cardigan off or putting it on. For example, a cardigan can be worn during a meeting and removed to a shirt during desk work. The level of formality can also be adjusted by opening and closing the buttons on the cardigan.

For accessories, a thin leather belt and a simple silver necktie pin can be added for a more sophisticated look. The combination of a cardigan and a shirt is a simple yet profound coordination, and is a style that shows the relaxed and mature attitude of men in their thirties.

Coordinate 3: Make a difference with an elegant jacket style

「Jacketsrefers to a style in which the jacket and pants are selected separately and combined.

The appeal of this style is that it is more casual than a suit, but still maintains a neat appearance. Why is jacketed pants so effective?COLORThe reason why jackets are so effective is that it is easy to express one's individuality through the combination of materials and styles.

For example, a gray wool-blend jacket, a light blue shirt, and navy slacks. On the feet, a pair of brownCOLORwingtip shoes for a classic yet playful look. The key to this style is to create a contrast between the jacket and pants to create a crisp look.

The key to success in the jackets and pants style is the combination of the material of the jacket and pants.COLORThe key to the success of the jacket style lies in the balance between the materials of the jacket and pants. For example, a spring-like tweed jacket can be worn with smooth-textured slacks to enjoy the contrast of materials. Also, keep the pants simple when the jacket is the star of the show, and keep the jacket understated when the pants are distinctive.

As for the use of accessories, a colorful pocket chief in the breast pocket or a patterned tie can be used to subtly express individuality. However, for office casual wear in one's thirties, it is important to keep in mind that it should be elegant without being too flashy.

Coordinate 4: A knit style that is both neat and relaxed

The knit style, which is less formal than a jacket but more formal than a T-shirt, is a strong ally of office casual wear.

 

Especially on chilly days in early spring, knitwear is useful for both warmth and lightness of appearance. The reason why knit styles are so effective is that they give a soft impression while at the same time expressing an adult's calmness.

 

A specific coordination would be a light gray crew-neck knit, layered with a white shirt showing a little of its collar, and navy slacks for bottoms. On the feet, brownCOLORsuede loafers for a spring-like look. The key to this style is to create a cozy look by layering the knit and shirt.

 

The key to a spring knit style is the choice of material. Choosing a high-quality material such as light merino wool, cotton, or cashmere blend will create a mature and dignified look that is not too casual.COLORFor taste, in addition to basic colors such as gray, beige, and navy, dull and pastel colors can also be used to create a soft, spring-like impression.

 

Another application of this coordination is to wear a white T-shirt or cut-and-sew underneath the knit, instead of a shirt. In a more casual work environment, this combination is sufficient to create a clean impression. On chilly days, it is also recommended to enjoy layering by adding a jacket or cardigan.

Coordinate 5: Simple is best! The royal style of shirt and slacks

The most basic and versatile casual office wear is the shirt and slacks combination.

Because it is so simple, it is important to choose a material and a style that is appropriate for the occasion.COLORand size, you can create a sophisticated impression. The reason why this style is so popular is that it can be adapted to any business situation and can be arranged in a wide range of ways.

Specifically, a spring-like pale pink oxford shirt is worn with dark gray slacks. The feet should be black or brown.COLORleather shoes to tighten up the look. The key to this style is the shirt'sCOLORand patterns of the shirt to express a sense of season and individuality.

The most important thing when wearing a shirt and slacks is the size of the shirt. especially the shirt,Shoulder widthand sleeve length, and the torso should fit snugly. A shirt that is too loose will give a sloppy impression. Ideally, slacks should also fit snugly around the waist and have hems that do not touch the floor.

To elevate this basic look a bit, accessories can be effective. For example, a good quality leather belt or a simple but presentable wristwatch will give a subtly sophisticated impression. Also, simply unbuttoning one button on your shirt or rolling up the sleeves will give you a more sophisticated look.

The shirt and slacks combination is a versatile style that allows you to add a jacket, cardigan, or knit depending on your plans and mood of the day, and we recommend that men in their 30s have a good quality shirt and slacks as the basis of their wardrobe.

Recommended items for office casual wear

Selecting quality items is essential to further brush up on office casual wear.

Here we introduce recommended items for men in their 30s in the categories of outerwear, tops, bottoms, and shoes. By combining these items, you can enjoy a variety of office casual styles. Review your own wardrobe and check for items you are missing.

Outerwear: jackets, cardigans, blousons

Office casual outerwear must have both business-appropriate dignity and a design that reflects the season and trends.

Outerwear for spring in particular should be easy to adjust to the temperature and have a light impression. The reason why the choice of outerwear is so important is that it greatly affects the overall impression of the coordinated outfit.

First, as for jackets, tailored jackets are the standard. Materials recommended for spring are lightweight wool, cotton, and linen blends,COLORAs for taste, basic colors such as navy, gray, and beige are easy to coordinate. A well-structured jacket will give you a beautiful shoulder line and a good-looking standing posture.

Next, cardigans are versatile items that are more relaxed than jackets, but can also produce a neat look. We particularly recommend a medium gauge cardigan with a V-neck, which goes well with a shirt and gives a sense of adult composure. Choose a light, spring-like material such as cotton or linen blend.

Finally, blousons work well in more casual work environments or on casual Fridays. Classic designs, such as swing tops and Harrington jackets, are especially ideal for an adult casual look. Materials should be cotton or nylon,COLORThe taste should also be subdued, such as navy or beige, to blend in with a casual office environment.

Even with the same innerwear and bottoms, these outerwear items can be swapped out to give a different look to the entire outfit, so it is a good idea to have a few items for a wide range of outfits. For example, you can use a jacket on Monday, a cardigan on Wednesday, and a blouson on Friday, depending on the day of the week.

Tops: Shirts, knits, and cut-and-sewns

Ideally, office casual tops should be both clean and seasonal.

Especially for spring tops,COLORand materials that express lightness and freshness. The reason why it is important to select tops is that they are items that come in direct contact with the skin, so not only appearance but also comfort is important.

First, for shirts, standard materials are oxford, broadcloth, and twill. Spring-likeCOLORFor taste, in addition to the standard colors of white and blue, light colors such as pink, lavender, and mint green are also recommended. In terms of patterns, understated designs such as fine stripes and gingham checks are suitable for office casual wear.

Next, knitwear is a useful item for chilly early spring days. Crew-neck or V-neck knits can be worn alone or layered with a shirt. Lightweight merino wool, cotton, and cashmere blends are recommended,COLORBasic colors such as gray, navy, and beige are easy to use.

Lastly, cut and sewn clothing is more casual, but can be incorporated into office casual wear if you choose good quality materials and elegant designs. Particularly recommended are cotton pique polo shirts and long-sleeved T-shirts with simple designs.COLORTastes are mainly basic colors such as white and navy, with a hint ofCOLORIt is also a good idea to use a spring-like color as an accent.

It is convenient to choose these tops with layering in mind so that they can cope with seasonal changes and daily temperature differences. For example, on chilly mornings, layer a knit over a shirt, and when it warms up during the day, take off the knit and go back to wearing a shirt.

Bottoms: Slacks, chinos, denim

Ideally, office casual bottoms should be both easy to move in and clean, while maintaining balance with the top.

Spring bottoms, in particular, should be made of light, seasonal materials andCOLORtaste is the key. The reason why the choice of bottoms is important is that they are an element that determines the overall silhouette and the impression of the walking figure.

First, for slacks, wool-blend and polyester-blend materials are the standard. Spring-likeCOLORAs for taste, basic colors such as navy, gray, and beige are easy to use and match with a variety of tops. As for silhouettes, a tapered silhouette with a bit of room for men in their 30s gives a cozy impression.

Next, chinos are more casual than slacks, but if you choose a beautiful design, they are ideal for office casual wear. Particularly recommended is stretchy cotton material that offers both ease of movement and good looks.COLORFlavors such as beige, khaki, and navy are standard, and spring-like bright beige and light gray are also easy to incorporate.

Finally, denim can be difficult to incorporate depending on the atmosphere of the workplace, but if you choose a darker color and a beautiful design, it can be used for casual days. In particular, dark indigo and black denim can be dressed up or down with a jacket.

As for silhouettes, straight or slim fit is suitable for men in their 30s. Choose a silhouette that is neither too thin nor too thick, but rather a perfect balance. Also, avoid low-rise jeans with a too shallow crotch and choose those with a moderate crotch depth, which will make you look beautiful when you sit down.

The key to choosing bottoms is balance with tops. For example, if you are wearing a loose-fitting shirt or knit, slim pants will tighten the silhouette and improve the overall balance. Conversely, a fitted top should be matched with pants that have a little more room.

Specific examples of coordination include the royal style of a white oxford shirt with gray slacks, or the fresh style of a light blue shirt with beige chinos. These combinations are highly versatile styles that can be adapted to various occasions simply by changing the outerwear and shoes.

In spring office casual wear, the degree to which bottoms are hemmed is also important. The ideal length for slacks is just enough to slightly cover the instep of the shoe, while the ideal length for chinos and denim is just enough to show the instep of the shoe. Socks that show 2~3cm from the hemCOLORsocks, which can be seen 2~3cm from the hem, will give a more sophisticated impression.

Shoes: Leather shoes, sneakers

Shoes greatly affect the impression of office casual wear.

Men in their 30s need a perfect balance of shoes that are neither too casual nor too formal. Here we will show you how to choose and wear leather shoes and sneakers.

First, for leather shoes, the standard designs are straight tip, plain toe, and wing tip. Recommended for springCOLORare black or dark brownCOLORas well as lighter browns and burgundies.COLORYou can create a seasonal look with your feet by incorporating other tastes as well. In addition to regular leather, variations in materials, such as suede and patent leather, will also add richness to the look.

The key to choosing leather shoes is to emphasize not only design but also comfort and maintainability. The shoes should have cushioning that prevents fatigue even after wearing them all day and durability for long use. Especially in your 30s, this is an important time to build up your career, so it is worth investing in good quality leather shoes that will last for a long time, even if they are a little expensive.

Next, sneakers may be difficult to incorporate depending on the atmosphere of the workplace, but if you choose a simple, clean design, they are useful for casual days. We especially recommend white, navy, or other subduedCOLORLeather sneakers in white or navy are especially recommended. Court or low-cut sneakers are more suitable for casual office wear than sporty running shoes.

The key to incorporating sneakers into office casual wear is to balance them with other items. For example, when wearing sneakers, combine them with neat items such as a jacket for the upper body. It is also important to keep sneakers clean and free of dirt and sagging.

Specific examples of coordinated outfits include a navy jacket, white shirt, beige chinos, and brownCOLORor a modern style with a gray cardigan, white T-shirt, navy slacks, and white leather sneakers.

When coordinating footwear, one should not forget to choose socks. In office casual wear, they should be similar to pants as in the suit style.COLORsocks, as in the suit style, but also subtle patterns andCOLORsocks with a subtle pattern or a subtle accent.

However, avoid overly flashy designs and choose those that give an elegant impression.

Don't make mistakes! Examples of office casual wear and how to improve them

Office casual is a dress code that offers a high degree of freedom, but it is also a dress code that is prone to failure.

Styling that lacks proper balance can lower your impression within the company. Here are some examples of common office casual mistakes made by men in their thirties, along with measures to remedy them. By following these tips, you can achieve a more sophisticated and mature office casual look.

First, the most common mistake is inappropriate sizing. Jackets and shirts that are too big and pants that are too bulky give a sloppy impression. The reason why sizing is so important is that clothes that fit your body lines are fundamental to creating a sense of cleanliness and trustworthiness before you even know how to dress. As a remedy, we recommend that you figure out what size fits your body shape and resize as necessary.

Specifically, jackets should beShoulder widthfits perfectly, the sleeve length should be long enough to slightly show the wrist, and pants should ideally fit around the waist and have hems that do not touch the floor. When trying on the garments, make sure to check the sitting and walking figures as well. Also, if your body shape has changed, consider having it re-sized or replacing it with a new item.

The next most common mistake is wearing too casual attire that does not fit the TPO. In particular, loud graphic T-shirts, ripped jeans, and sporty sneakers should be avoided, no matter how relaxed the work environment. This is because these items are casual leisure wear and do not belong in a business setting.

As a remedy, even when casual items are incorporated, they should be cleanly designed and calmlyCOLORIt is important to choose items that have a clean design and a relaxed taste. For example, choose a simple plain T-shirt, dark-colored jeans with a clean silhouette, and sneakers with a simple design made of leather.

Also, choose a pair of sneakers with a simple design made of leather,COLORWe also see mistakes in the combination of the following Too flashy.COLORuse, or using the sameCOLORis to be avoided in office casual wear. Because, in business situations, it is important to look calm and intelligent.COLORand intelligence is required in business situations.

To improve this, basic colors (navy, gray, beige, white, etc.) should be used as the main color scheme, with a single accent color.COLORIt is important to have a sense of balance between the basic colors (navy, gray, beige, white, etc.) and a few accent colors. For example, a navy jacket, white shirt, and beige pants combination with red or blue accessories as accents is recommended.

Furthermore, there are many mistakes that lack a sense of unity in material. For example, a light linen jacket for summer paired with thick wool pants for winter, for example, is an incongruous coordination with an incongruous sense of the season. The reason why it is important to unify the sense of material is to give the impression of overall harmony.

As a remedy, it is important to choose materials appropriate for the season and to be aware of the overall balance. For spring office casual wear, focus on spring-like materials such as cotton, linen, and lightweight wool, and be aware of overall unity.

Finally, it is easy to forget the importance of using small accessories. Small details such as a cheap belt, watch, or casual socks like sneakers can bring down the overall impression. Why? Because accessories are an important element in completing the overall look.

As a remedy, it is important to pay attention to accessories such as belts, watches, socks, and bags, and choose good quality ones. Especially for men in their 30s, investment in accessories can greatly affect the overall impression. For example, a good quality leather belt or a simple but high-quality watch will elevate the overall look.

With these NG examples and remedial measures in mind, try to maintain an office casual look that is appropriate for the atmosphere of your workplace, your position, and your body type.

Appropriate office casual wear is also an important element of your work attitude and trustworthiness.

In summary: Enjoy office casual with a style that suits you!

So far, we have discussed various aspects of spring office casual for men in their 30s. Office casual is a profound dress code that allows you to express your personality and sense of the season while maintaining a sense of cleanliness and trustworthiness appropriate for the business scene.

Finally, let us summarize some points to further enjoy office casual.

The most important thing with office casual is to find a style that suits you. While taking into consideration your body shape, atmosphere, and work environment, look for a style that you are comfortable in and that will also make a good impression on those around you.

 

The reason this is important is that a style that suits you will give you confidence and have a positive impact on your work performance.

Specifically, start by knowing your "strengths" and "weaknesses. For example, if you are confident in your upper body, you can attract people with fitted shirts and jackets. Conversely, if you have a lower body complex, try to style your clothes in a way that takes advantage of your body type characteristics, such as covering it up with slacks that have a moderate amount of room.

 

Also, consider the atmosphere of the workplace and the characteristics of the industry. For example, for a more formal workplace such as the financial or legal industry, a jacket style should be the basic style, while for a more casual workplace such as the IT or creative industry, a knit or cardigan style should be the main style.

In addition, it is important to take advantage of the fact that you are in your thirties, and enjoy a balance between "mature" and "modern" styles that are unique to your thirties, rather than focusing on trends like those of your twenties or being too conservative like those of your forties or older.

To enjoy office casual wear more, it is also important to avoid "the same thing every day. For example, wear a jacket on Mondays, a cardigan on Wednesdays, and a lighter style on Fridays as a casual day.

Finally, we must not forget the "sense of the season. Spring, in particular, is the transitional season from winter to summer, and temperatures change dramatically. Make good use of layering and try to coordinate your clothes in a way that allows for easy temperature adjustment. Also,COLORand materials to express a spring-like feeling, you can enjoy styling with a sense of the season.

The 30s is an important time for both your career and personal relationships. Enhance your personal attractiveness and enjoy a fulfilling business life through your daily styling.

Fashion is a field where there is no "right" answer.

What we have introduced in this article are only basics and reference examples, so by all means, add your own twist and enjoy an office casual style full of originality.

Above all, remember to "enjoy" styling, which is the first step to becoming a fashion expert.