The "Kuchiina Channel," currently airing on Mitsukoshi Isetan's official video channel "GUIDE by ISETAN MITSUKOSHI," features Inaba, a buyer for Isetan Shinjuku Store, Men's Building and Kucchi, a category specialist, showcasing the charms of Isetan Shinjuku Store, Men's Building along with its finest products. The theme of the fifth installment is "Adult Summer Style," featuring six outfits. This time of year, when the summer heat makes choosing an outfit difficult, the two delve into recommended outfits that are uniquely Isetan Shinjuku Store, Men's Building through their engaging banter.
*The prices of the products listed in this article are as of June 24th (Wednesday).

Summer is officially here! Isetan Shinjuku Store, Men's Building has all the items you'll want to wear right now.

Six recommended "adult summer styles" for when you're unsure what to wear.

1. giabsarchivio custom-made setup

Kucchi : Based on the "DOSSO" jacket and "MASACCIO 3G" pants, I went up about 1.5 sizes to create a more modern, relaxed fit. The jacket is lightweight, has no chest pocket, straight sleeves, and patch pockets.

Inaba : "I like the wool-like texture of the material. It's a strong point that it can be used for business while also being lightweight. The pants also have permanent creases, which is a key point as it hides the sporty look."

Kucchi : It comes in two colors, including gray. It can be coordinated with shirts and ties, or with T-shirts, and it's wrinkle-resistant, so it's convenient to keep in the office.

Inaba : The jacket and pants are sold separately, so you can adjust the size.

2. TOHNAI Cotton Set-up

Inaba : Next up is TOHNAI . It looks like wool, but it's actually made from 100% cotton with a strong twist.

Kucchi : It's lightweight and perfect for summer. The fine yarn has been treated with a chintz finish and washing process, resulting in a fabric that combines the best of luster, softness, and lightness. It's a military-style blouson with a short A-line silhouette.

Inaba : The pants have deep double pleats and a wide fit. They can be worn both on and off duty, and would suit people in creative professions as well.

Kucchi : The jacket and pants are sold separately, so you can adjust the size and silhouette.

3. Summer linen shirt & slacks

Kucchi : For a summer office look, a collared shirt is effective. It looks appropriately smart even without a jacket. I recommend LUIGI BORRELLI "VESUVIO-EX". It comes in three materials: linen-cotton, cotton, and linen, and is available in over 50 colors. It's a short length that can be worn tucked in or out, and the collar opening and button placement are popular.

Inaba : Originally, many Neapolitan shirts were made with the assumption that they would be tucked in, but in recent years, there's been a demand for a good balance between being able to wear them tucked in and out.

Kucchi : The one-piece collar design looks great even without a tie, and pairing it with a T-shirt gives it a summery feel.

Inaba : The trousers I'm pairing them with are a collaboration between Piety Torino, Vitale Barberis Canonico, and ISETAN MEN'S They're made with 21-micron wool, have a single pleat, and a slim tapered fit. Priced at 49,500 yen, this model really showcases the companies' efforts.

Kucchi : A must-have item is a pair of medium gray wool trousers. They pull the whole look together, even if the shirt is casual.

4. Dress polo shirt & cotton pants

Kucchi : GUY ROVER pique dress polo shirt. Long sleeves are recommended this time. Black is becoming increasingly popular, and there are many classic colors available.

Inaba : Features a gusset, allowing for both tucking in and leaving out.

Kucchi : The matching pants are a model supervised by Mr. Osaku of Eminent. They are khaki in color, 100% cotton, with two pleats and a slim fit with a gentle taper. They feature meticulous details such as welt stitching, narrow belt loops, and a zipper design.

Inaba : A brand specializing in pants, known for its high-quality craftsmanship and attention to every detail. It's a brand that truly reminds us of the excellence of Japanese manufacturing.

5. Off-duty style in mid-summer (urban style)

Kucchi : Adult T-shirts and shorts are tricky to style well, but it's worth a try. I especially want adults to wear shorts. First up, BATONER wool knit T-shirt + Tangent Gurkha shorts. The wool T-shirt is cool and comfortable against the skin. The shorts are wide, long, have two pleats, and lots of buttons, making them for advanced wearers.

Inaba : This popular model features a modern interpretation of military details. Tucking in your shirt is recommended.

6. Off-duty style in mid-summer (resort)

Kucchi : Next up is a smooth SUNSPEL classic T-shirt made from Suvin cotton, paired with giabsarchivio “MAGNIFICO” shoes. The ideal silhouette is neither too slim nor too baggy.

Inaba : The secret to avoiding looking childish is to differentiate yourself with leather sandals, sneakers, and accessories.

Isetan Shinjuku Store, Men's Building , has a lineup of items we can't fully introduce here! Please feel free to ask us anything.

Isetan Shinjuku Store, Men's Building offers a wide variety of items that we couldn't showcase in this video. Many items are available both in-store and online. Consult with a stylist at Isetan Shinjuku Store, Men's Building about your needs, and you might discover a new you. And the continuation of "Kuchiina Channel" depends on your feedback. Please leave comments, subscribe, and give us a thumbs up!

[Watch the video]
Six "Adult Summer Styles" Selected by Isetan Buyers & Stylists! Kuchiina, Part 5

*The information in this article is current as of June 24, 2026. Product information may be revised or changed without notice.

Production STUDIO ALTA

Inquiries: Isetan Shinjuku Store
For inquiries via email, please click here.