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 

Size	Chest	Shoulder Width	Length	Waist Width	Sleeve Length
38 (M)	20.5	16.5	24.4	18.9	23.2
40 (L)	21.7	17.3	25.2	19.7	24.0
42 (XL)	22.8	18.1	25.6	20.5	24.8
44 (XXL)	23.6	18.9	26.0	21.3	25.6

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.