About Us

  • Day One Underwear. About Us. About Day One Underwear. Package Design.

    About Day One Underwear™️

    Underwear used to be a part of men's fashion back in the 1960s & 1970s.

    Our passion is to assist you to be yourself from the inside out.

    Just like the vintage underwear used to do back in the day.

  • made in japan underwear, heritage style. poplin boxer, cotton boxer shorts.

    How We Started

    After collecting tons of vintage, we found the best underwear to make your style perfect.

    We stared from rebuilding the old sewing machine to bring the old soft-cushioned waistband back to the present.

  • Day One Underwear About Us. Who we are.

    Who We Are

    Launched Tapered Boxer Shorts in January 2023.

    Based in Tokyo.

    Our products are all handmade in Japan with craftsmanship, by an underwear factory founded in the 1950s.

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Why Shop With Us

🩳 Vintage Underwear Reproduction
🇯🇵 Made in Japan Quality
✈️ Worldwide Delivery

Customer Reviews

Based on 22 reviews
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95.5
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A.Y
イメージ通り

少しロング丈のテーパードシルエットがカッコ良く、履き心地も良かった。173cm 65kg 32size
発色の良いカラーにパイピングがいい味だしてます。全色揃えたくなりますね。

この度は、レビューをお寄せいただき、ありがとうございます。
サイズ32インチがちょうどよくフィットしたとのこと、本当に嬉しい限りです。
カラーバリエーションのアイデアもご共有いただき、ありがとうございます。
またお選びいただけるような商品づくりを続けていきたいと思います。

H
Hasif

Great Boxer

H
Hasif Hasbollah
Great Boxer!!!

Great Boxer!!!

L
Luc Bonami
Purchase

Very nice product but sizes seem Japanese (smaller than expected)

Thank you for your review. We understand your feedback. This is Tapered cut boxer, and the size 30 is the smallest size as of now. We are currently preparing to produce bigger sizes. Thank you.

D
David Kopler
Quality made with details

These are awesome. The details are great and they fit spot on. I would suggest putting a seam in the back -otherwise they are perfect

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