01507L-ISHIKAWADAI - 15oz Selvedge Denim Jacket - Type I

ONI’s Ishikawadai denim represents one of the most distinctive fabrics in modern Japanese denim. The yarn is spun on a vintage Ishikawadai ring-spinning machine built in 1953 by Ishikawadai Seisakujo, a piece of equipment that runs at roughly one third the speed of modern machinery. That slow, deliberate process creates irregular, textured yarn with a raw, uneven character that modern high-speed spinning simply can’t replicate.

Those yarns are then dyed in ONI’s signature green-cast “secret” indigo, a shade that interacts beautifully with the uneven texture created by the Ishikawadai process. The result is denim that feels rugged and organic from the first wear, with a vintage personality that only deepens as the indigo fades. At 15oz, the fabric hits a sweet spot for everyday wear, offering a lighter weight that still carries ONI’s signature low-tension weave and substantial hand.

This Type I jacket follows the classic mid-century blueprint while incorporating a few thoughtful details. A lower left patch pocket adds practical storage, while the traditional cinch-back anchors the jacket firmly in its vintage roots. Combined with ONI’s uniquely textured Ishikawadai denim, it creates a jacket that feels both historically grounded and unmistakably modern.

• 15oz Selvedge Denim
• 100% Cotton
• Tempi One-Wash Treatment
• Copper Hardware
  
• Type I Patch Pocket
  
• Cinch Back
• Curtain Pleats
• Box Tacks
• Dual-tone Contrast Stitching
• Vegetable Tanned Leather Patch
• Made in Japan 

A variance of +/-.5" is within tolerance.

Fit Notes: Shop owner Tommy is wearing a size 42 in this jacket. To fit the roomier look of the pants, he wanted a size larger than he normally wears. As you can see, these fit a little smaller than the other two. This is how a classic type I is supposed to fit. So we are always going to recommend sizing up at least once in these. Tommy is 5'9," 165lbs, with a 41" chest.