GU to lululemon clothing size
The short answer
GU XS is lululemon XXXS by the two brands' own charts. 7 of 7 GU sizes land on a different label at lululemon.
Both brands publish the body bust each size is cut for, so every row matches a bust, not a letter or a number.
On 3 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 | lululemon, by chart | Same label | lululemon builds it for | lululemon also prints |
|---|---|---|---|---|---|
| XS | bust 27.6 to 29.5 in, waist 21.3 to 23.2 in, hip 30.3 to 31.9 in | XXXS | XS | bust 28.5 in | US 0 |
| S | bust 29.5 to 31.5 in, waist 23.2 to 24.8 in, hip 31.9 to 33.5 in | XS or XXS | S | bust 31 to 32 in | US 4 |
| M | bust 31.5 to 33.5 in, waist 24.8 to 26.4 in, hip 33.5 to 35 in | XS or S | M | bust 31 to 32 in | US 4 |
| L | bust 33.5 to 35.4 in, waist 26.4 to 28 in, hip 35 to 36.6 in | S or M | L | bust 33 to 34 in | US 6 |
| XL | bust 35.4 to 37.8 in, waist 28 to 30.3 in, hip 36.6 to 38.6 in | L or M | XL | bust 37 to 38.5 in | US 10 |
| XXL | bust 37.8 to 40.2 in, waist 30.3 to 32.7 in, hip 38.6 to 40.6 in | L or XL | not published | bust 37 to 38.5 in | US 10 |
| 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 40 to 42 in | US 12-14 |
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.
- lululemon size guide, read on 2026-09-18. lululemon on TrueToSize