GU to Vuori size
The short answer
GU XS is Vuori XXS by the two brands' own charts. 7 of 7 GU sizes land on a different label at Vuori.
Both brands publish the body chest each size is cut for, so every row matches a chest, not a letter.
On 2 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 | Vuori, by chart | Same label | Vuori builds it for | Vuori also prints |
|---|---|---|---|---|---|
| XS | chest 29.9 to 33.1 in, waist 25.2 to 28.4 in | XXS | XS | chest 33 to 35 in | not published |
| S | chest 31.5 to 34.7 in, waist 26.8 to 29.9 in | XXS | S | chest 33 to 35 in | not published |
| M | chest 34.7 to 37.8 in, waist 29.9 to 33.1 in | XS | M | chest 35 to 37 in | not published |
| L | chest 37.8 to 40.9 in, waist 33.1 to 36.2 in | M | L | chest 39 to 41 in | not published |
| XL | chest 40.9 to 44.1 in, waist 36.2 to 39.4 in | L | XL | chest 41 to 43 in | not published |
| XXL | chest 44.1 to 47.2 in, waist 39.4 to 42.5 in | XL | XXL | chest 43 to 46 in | not published |
| 3XL | chest 47.2 to 50.4 in, waist 42.5 to 45.7 in | XXL | 3XL | chest 46 to 49 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.
- Vuori size guide, read on 2026-09-18. Vuori on TrueToSize