Iron Heart IH-634S-B Size Chart
Every published measurement for the Iron Heart IH-634S-B, size by size, widths flat and waist doubled, the numbers the tag size doesn't tell you.
In a size 35, the Iron Heart IH-634S-B measures 35″ waist, 11″ front rise, 13″ thigh and 8.75″ leg opening. Sizes on its chart run from 0.7″ under the tag to ½″ over it, and each size up adds 1.1″. From knee to hem, the leg narrows ½″.
| Size | Waist | Front Rise | Back Rise | Thigh | Knee | Leg Opening | Inseam |
|---|---|---|---|---|---|---|---|
| 30 | 30 | 10.25 | 13.75 | 11.5 | 8.5 | 7.75 | 35 |
| 31 | 30.3 | 10 | 14 | 11.75 | 8.75 | 8.25 | 34.75 |
| 32 | 31.5 | 10.5 | 14.5 | 12.25 | 8.75 | 8.25 | 35 |
| 33 | 33 | 10.75 | 14 | 12.5 | 9 | 8.5 | 35 |
| 34 | 34.5 | 11 | 14.5 | 12.75 | 9.25 | 8.75 | 35.25 |
| 35 | 35 | 11 | 14.5 | 13 | 9.25 | 8.75 | 35 |
| 36 | 36 | 11.25 | 14.75 | 13.25 | 9.6 | 9 | 35 |
| 38 | 38 | 11.5 | 15.4 | 14 | 10 | 9.5 | 35.25 |
| 40 | 39.5 | 12 | 15 | 14.5 | 10.5 | 9.75 | 35.25 |
| 42 | 42 | 12.25 | 15.75 | 14.5 | 10.5 | 9.75 | 35.25 |
Scroll the table sideways for the rest of the columns.
Listed under: Straight · Regular · Biggest Waists
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About Iron Heart
Established in 2002 by Shinichi Haraki, Iron Heart began as a clothing brand for Japan’s motorcycling community, drawing on Haraki’s two decades in the Japanese garment industry, where he started as a pattern maker. Its company, Works Inc, is based in Japan with offices in Shibuya and Hachioji, and works mostly with small, family-run mills and workshops. The brand is known for heavyweight denim and durable fabrics, including Japanese-made jeans in cloth as heavy as 21oz and beyond.
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Source: retailer size chart (opens in new tab). Last verified 2026-09-22. Always confirm with the retailer before buying — fits are re-cut seasonally.