IMPORTANT. The sizing of Iron Heart tops (as with most Japanese brands) runs smaller than their Western equivalents (of S, M, L etc). Please do not assume that because you are normally an L, that you will be an L in these, you really should check the measurements below.

| IMPORTANT. The sizing of these Jackets runs smaller than the Western equivalents (of S, M, L etc). Please do not assume that because you are normally an L, that you will be an L in these, you must check the measurements below. |
| CMs | S | M | L | XL | XXL | | A Chest | 114.0 | 120.0 | 126.0 | 132.0 | 132.0 | | B Length | 69.0 | 71.0 | 73.0 | 75.0 | 77.0 | | C Hem | 108.0 | 112.0 | 118.0 | 122.0 | 122.0 | | D Arm | 89.0 | 91.0 | 93.0 | 95.0 | 97.0 |
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| Inches | S | M | L | XL | XXL | | A Chest | 44.5 | 46.8 | 49.1 | 51.5 | 51.5 | | B Length | 26.9 | 27.7 | 28.5 | 29.3 | 30.0 | | D Hem | 42.1 | 43.7 | 46.0 | 47.6 | 47.6 | | E Arm | 34.7 | 35.5 | 36.3 | 37.1 | 37.8 |
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