GU to Whistles clothing size
The short answer
GU L is Whistles 10 by the two brands' own charts.
Both brands publish the body bust each size is cut for, so every row matches a bust, not a letter or a number.
| GU Japan sizing | GU builds it for | Whistles, by chart | Same label | Whistles builds it for | Whistles also prints |
|---|---|---|---|---|---|
| XS | bust 27.6 to 29.5 in, waist 21.3 to 23.2 in, hip 30.3 to 31.9 in | 04 | not published | bust 30 in, waist 23.5 in, hip 34.5 in | not published |
| S | bust 29.5 to 31.5 in, waist 23.2 to 24.8 in, hip 31.9 to 33.5 in | 06 or 04 | not published | bust 31 in, waist 24.5 in, hip 35.5 in | not published |
| M | bust 31.5 to 33.5 in, waist 24.8 to 26.4 in, hip 33.5 to 35 in | 08 | not published | bust 32 in, waist 25.5 in, hip 36.5 in | not published |
| L | bust 33.5 to 35.4 in, waist 26.4 to 28 in, hip 35 to 36.6 in | 10 | not published | bust 34 in, waist 27.5 in, hip 38.5 in | not published |
| XL | bust 35.4 to 37.8 in, waist 28 to 30.3 in, hip 36.6 to 38.6 in | 12 | not published | bust 36 in, waist 29.5 in, hip 40.5 in | not published |
| XXL | bust 37.8 to 40.2 in, waist 30.3 to 32.7 in, hip 38.6 to 40.6 in | 14 or 16 | not published | bust 38 in, waist 31.5 in, hip 42.5 in | not published |
| 3XL | bust 40.2 to 43.3 in, waist 32.7 to 35.4 in, hip 40.6 to 43.3 in | 18 | not published | bust 42.5 in, waist 35.5 in, hip 46.5 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
- GU Japan sizing size guide, read on 2026-09-25.
- Whistles size guide, read on 2026-09-18.