Kojima Genes RNB1221R 21oz Size Chart
Every published measurement for the Kojima Genes RNB1221R 21oz, size by size, widths flat and waist doubled, the numbers the tag size doesn't tell you.
In a size 34, the Kojima Genes RNB1221R 21oz measures 33.75″ waist, 11″ front rise, 12.5″ thigh and 8.25″ leg opening. Sizes on its chart run from ¾″ under the tag to ¾″ over it, and each size up adds ¾″.
| Size | Waist | Front Rise | Thigh | Leg Opening | Inseam |
|---|---|---|---|---|---|
| 30 | 30.75 | 9.75 | 11.75 | 7.75 | 33.75 |
| 31 | 31.75 | 9.75 | 12 | 8 | 33.75 |
| 32 | 32.25 | 10.75 | 12.25 | 8 | 33.75 |
| 33 | 33.25 | 10.5 | 12.5 | 8.25 | 33.75 |
| 34 | 33.75 | 11 | 12.5 | 8.25 | 33.75 |
| 36 | 35.75 | 11 | 13 | 8.75 | 33.75 |
| 38 | 37.75 | 11.5 | 13.25 | 8.75 | 33.75 |
| 40 | 39.75 | 11.5 | 13.75 | 9 | 33.75 |
| 42 | 41.25 | 11.75 | 14.25 | 9 | 33.75 |
Scroll the table sideways for the rest of the columns.
Listed under: Straight · Regular · Biggest Waists
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Where to buy
- Denimio (opens in new tab)$141In stock
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About Kojima Genes
Kojima Genes is the jeans brand of HOOK Co., Ltd., a company established in Kojima, Kurashiki City, Okayama, in 1996, which launched the line in 2009. The name plays on “genes,” reflecting the aim of passing Kojima’s textile skills to the future. Production is handled in-house from fabric making through sewing, washing, and finishing, with Japanese denim developed with Kuroki and heavy fabrics sewn on adapted vintage machines. The brand is known for rope-dyed, heavyweight denim from 13oz to 23oz and a lifetime repair guarantee.
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Source: retailer size chart (opens in new tab). Last verified 2026-09-23. Always confirm with the retailer before buying — fits are re-cut seasonally.