Belle Maison, the mail-order business operated by Senshukai Co., Ltd. (headquarters: Osaka City, Representative Director and President: Satoshi Suzuki), will launch a new collaboration apparel collection with popular stationery and lifestyle brand SWIMMER on February 19, 2026, via Belle Maison Net.
First-Ever Adult Sizes Join the Lineup
Building on the previously released baby and kids' items, this series introduces two major additions: unisex kids' half-sleeve T-shirts (4 designs, ¥1,590 each including tax) and ladies' apparel (2 designs, ¥3,490 each including tax) designed for the SWIMMER generation, primarily women in their 30s but spanning from their 20s to 40s.
Product Lineup Features
1. NEW: Ladies' Apparel (Adult Size)
The adult-sized items feature design motifs linked to the baby and kids' collections, creating subtle matching possibilities that make them easy to wear without feeling too matchy-matchy. These pieces are perfect for first-time parent-child coordination.
2. UPDATED: Unisex Kids' Items
In addition to the existing whimsical designs, the collection has evolved to include items developed in response to customer feedback received via social media requesting "designs boys can wear too." The lineup now features calmer colors like navy and blue along with simpler designs, allowing anyone to enjoy the SWIMMER aesthetic regardless of gender.
©patty's
Background: Connecting Parents and Children Through "Heisei Retro"
Responding to the current "Heisei Retro" boom, the generation that grew up with SWIMMER stationery has now become parents, showing increasing interest in enjoying the brand's aesthetic with their children. The first-ever ladies' items were planned by a buyer who spent her youth with SWIMMER. With a focus on creating "clothes that are cute yet easy for adults to wear," the collection features five-minute sleeves that cover upper arms and drawstring details that create a flattering silhouette, addressing the concerns and body types of adult women.
Comment from Belle Maison Product Development Team
We focused on creating designs that evoke the same excitement as choosing SWIMMER pouches and towels at stationery stores during our student days. The bright SWIMMER colors and art-filled designs are the key highlights.
New Product Details
*Available for viewing starting February 19, 2026
©patty's
Features include five-minute sleeves that cover upper arms and drawstring design details for a flattering, fashionable silhouette. The patchwork-style design artwork links with the baby and kids' T-shirt patterns, enabling parent-child matching coordination.
Product Name: SWIMMER Collaboration Drawstring Ladies Five-Minute Sleeve T-shirt
Price: ¥3,490 (tax included)
Colors: 2 colors (Navy, Red)
Size: 1 size (M to L)
URL: https://www.bellemaison.jp/cpg/prr/pr_prs_260201_1272361/
©patty's
Pair with the "Drawstring Ladies Five-Minute Sleeve T-shirt" for parent-child coordination.
Product Name: SWIMMER Collaboration All-Over Print Half-Sleeve T-shirt
Price: ¥1,590 (tax included)
Colors: 2 colors (Ivory, Red)
Sizes: 5 sizes (80, 90, 100, 110, 120) *Sizes 80 and 90 feature left shoulder snap button closure
URL: https://www.bellemaison.jp/cpg/prr/pr_prs_260201_1272359/
©patty's
Responding to customer requests for "designs boys can wear too," featuring simple designs and calmer colors.
Product Name: SWIMMER Collaboration Raglan Half-Sleeve T-shirt
Price: ¥1,590 (tax included)
Colors: 2 colors (Navy, Red)
Sizes: 5 sizes (80, 90, 100, 110, 120) *Sizes 80 and 90 feature left shoulder snap button closure
URL: https://www.bellemaison.jp/cpg/prr/pr_prs_260201_1272360/
Related Products
Other SWIMMER products: https://www.bellemaison.jp/cpg/prr/pr_sw_list/
About SWIMMER
SWIMMER is a lifestyle brand offering apparel, fashion accessories, bags, pouches, wallets, interior goods, and stationery. Featuring designs with motifs of animals, sweets, and more, the brand gained popularity across a wide age range for approximately 30 years from 1987. After ceasing operations in 2018, SWIMMER was revived in 2020 under new management by Patty's Corporation, attracting attention from both longtime fans and new followers.
About Belle Maison
A mail-order brand launched by Senshukai in 1976. The online shop "Belle Maison Net" (https://www.bellemaison.jp/) offers fashion, cosmetics, accessories, interior goods, character merchandise, and more, providing original products and services that cater to various lifestyles and life stages.
Official X (formerly Twitter): https://x.com/bellemaison_jp
Official LINE: https://lin.ee/CApSbIr
Official Instagram: https://www.instagram.com/bellemaison.jp/
Belle Maison celebrated its 50th anniversary in 2026. Under the theme "Love, then Ideas," the brand continues to propose "beloved living" through unique products and services, expressing gratitude for 50 years of support.
