GASP Size Chart
| Chest | Waist | Seat | Inseam | |
| S | 41.5 – 43 | 29 – 31 | 36.5 – 39 | 30 |
| M | 43 – 45.5 | 31 – 33.5 | 39 – 41.5 | 30.5 |
| L | 45.5 – 47.5 | 32.5 – 36 | 41.5 – 43.5 | 31.5 |
| XL | 47.5 – 50 | 36 – 38 | 43.5 – 46 | 32.5 |
| 2XL | 50 – 52.5 | 38 – 40.5 | 46 – 48.5 | 33 |
| 3XL | 52.5 – 54.5 | 40.5 – 43 | 48.5 – 51 | 34 |
| 4XL | 54.5 – 57 | 43 – 45.5 | 51 – 53.5 | 34.5 |