Lululemon to GU size
The short answer
lululemon XS is GU M by the two brands' own charts. 4 of 7 lululemon 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.
On 1 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.
| lululemon | lululemon builds it for | GU Japan sizing, by chart | Same label | GU builds it for | GU also prints |
|---|---|---|---|---|---|
| XS | chest 35 to 36 in | M | XS | chest 34.7 to 37.8 in, waist 29.9 to 33.1 in | not published |
| S | chest 37 to 38 in | M | S | chest 34.7 to 37.8 in, waist 29.9 to 33.1 in | not published |
| M | chest 39 to 40 in | L | M | chest 37.8 to 40.9 in, waist 33.1 to 36.2 in | not published |
| L | chest 41 to 42 in | XL | L | chest 40.9 to 44.1 in, waist 36.2 to 39.4 in | not published |
| XL | chest 43 to 45 in | XL | XL | chest 40.9 to 44.1 in, waist 36.2 to 39.4 in | not published |
| XXL | chest 46 to 48 in | XXL | XXL | chest 44.1 to 47.2 in, waist 39.4 to 42.5 in | not published |
| 3XL | chest 50 to 52 in | 3XL | 3XL | chest 47.2 to 50.4 in, waist 42.5 to 45.7 in | not published |
| 4XL | chest 53 to 55 in | not made | not published | not published | not published |
| 5XL | chest 56 to 58 in | not made | not published | not published | 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
- lululemon size guide, read on 2026-09-18. lululemon on TrueToSize
- GU Japan sizing size guide, read on 2026-09-25.