Champion to GU size
The short answer
Champion XS is GU S by the two brands' own charts. 6 of 6 Champion sizes land on a different label at GU.
Both brands publish the body chest each size is cut for, so every row matches a chest, not a letter.
| Champion | Champion builds it for | GU Japan sizing, by chart | Same label | GU builds it for | GU also prints |
|---|---|---|---|---|---|
| XS | chest 32 to 36 in, waist 28 to 30 in | S | XS | chest 31.5 to 34.7 in, waist 26.8 to 29.9 in | not published |
| S | chest 36 to 38 in, waist 30 to 32 in | M | S | chest 34.7 to 37.8 in, waist 29.9 to 33.1 in | not published |
| M | chest 38 to 41 in, waist 32 to 35 in | L | M | chest 37.8 to 40.9 in, waist 33.1 to 36.2 in | not published |
| L | chest 41 to 45 in, waist 35 to 39 in | XL | L | chest 40.9 to 44.1 in, waist 36.2 to 39.4 in | not published |
| XL | chest 45 to 49 in, waist 39 to 44 in | XXL | XL | chest 44.1 to 47.2 in, waist 39.4 to 42.5 in | not published |
| 2XL | chest 49 to 53 in, waist 44 to 48 in | 3XL | XXL | chest 47.2 to 50.4 in, waist 42.5 to 45.7 in | not published |
What wearers say
Charts describe a garment, not a fit. We do not collect fit reports for this category yet, so this table is the two brands' own claims and nothing more.
Sources
- Champion size guide, read on 2026-09-18.
- GU Japan sizing size guide, read on 2026-09-25.