121S Ishikawadai 15oz Slim Tapered Stretch Jean

Oni 121S "Ishikawadai" Stretch Selvedge Denim Jeans

• 98% cotton / 2% polyurethane / 15oz
• One Wash / Pre-washed to prevent any shrinkage
• Slim Tapered fit
• Low-tension weaving
• Warp yarn (outer): Indigo Greencast
• Weft yarn (inner): natural
• Selvedge denim with pink ID
• Chain-stitched seams
• Button fly
• "Donut" buttons with Oni branding
• Hidden copper rivets on back pockets
• Raised belt loops
• Vegetable-tanned leather patch
• Woven and made in Japan

Oni is a mysterious label behind which stands a true denim enthusiast who has devoted over 60 years of his life to the craft. Constantly striving for perfection, Oishi-san is in a perpetual state of research and focuses solely on production. This is why you won’t find any official website or Instagram page for the brand. It is also why the label is only distributed in a handful of stores worldwide, and exclusively at Flâneurs in France.

Made from a 15oz fabric, the "Ishikawadai" is crafted using cotton spun on a Japanese Ishikawadai machine—the oldest of its kind, dating back to 1953. Unlike modern machines, the Ishikawadai spins cotton at a much slower speed (around 30%), resulting in less stressed fibers and giving the fabric a more natural appearance. The result is similar to hand-spun yarn, with subtle variations in thickness and a slightly irregular, textured feel.

Another distinctive feature of this model is that it is woven using the same cotton as the famous Secret Denim, one of Oni’s signature fabrics. Its unique color comes from combining a warp yarn dyed in Greencast indigo, with green/blue undertones, and a beige weft yarn.

Finally, this is a "Stretch" version incorporating 2% polyurethane. This allows the fabric to retain its authentic textured character—true to the brand’s signature—while providing added flexibility and comfort.

The 121S features a Slim Tapered fit, with a mid-rise waist, a comfortable thigh, and a gradually tapered leg from the knee down to the hem.