GU to Athleta clothing size
The short answer
GU S is Athleta XXS by the two brands' own charts. 6 of 6 GU sizes land on a different label at Athleta.
Both brands publish the body bust each size is cut for, so every row matches a bust, not a letter or a number.
On 4 sizes the charts land two or more sizes from the same label. Brands do not measure the body the same way, so on those rows treat the chart answer and the same label as the two ends of a range.
| GU Japan sizing | GU builds it for | Athleta, by chart | Same label | Athleta builds it for | Athleta also prints |
|---|---|---|---|---|---|
| XS | bust 27.6 to 29.5 in, waist 21.3 to 23.2 in, hip 30.3 to 31.9 in | not made | XS | not published | not published |
| S | bust 29.5 to 31.5 in, waist 23.2 to 24.8 in, hip 31.9 to 33.5 in | XXS | S | bust 31.5 in, waist 24.3 in, hip 34 in | US 00 |
| M | bust 31.5 to 33.5 in, waist 24.8 to 26.4 in, hip 33.5 to 35 in | XS | M | bust 32.5 to 33.5 in, waist 25.3 to 26.3 in, hip 35 to 36 in | US 0-2 |
| L | bust 33.5 to 35.4 in, waist 26.4 to 28 in, hip 35 to 36.6 in | S | L | bust 34.5 to 35.5 in, waist 27.3 to 28.3 in, hip 37 to 38 in | US 4-6 |
| XL | bust 35.4 to 37.8 in, waist 28 to 30.3 in, hip 36.6 to 38.6 in | M | XL | bust 36.5 to 37.5 in, waist 29.3 to 30.3 in, hip 39 to 40 in | US 8-10 |
| XXL | bust 37.8 to 40.2 in, waist 30.3 to 32.7 in, hip 38.6 to 40.6 in | L | not published | bust 39 to 40.5 in, waist 31.8 to 33.3 in, hip 41.5 to 43 in | US 12-14 |
| 3XL | bust 40.2 to 43.3 in, waist 32.7 to 35.4 in, hip 40.6 to 43.3 in | XL | not published | bust 42 in, waist 34.3 in, hip 44.5 in | US 16-18 |
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.
- Athleta size guide, read on 2026-09-18. Athleta on TrueToSize