Lululemon to Gap clothing size
The short answer
lululemon XXS is Gap 000 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.
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.
| lululemon | lululemon builds it for | Gap, by chart | Same label | Gap builds it for | Gap also prints |
|---|---|---|---|---|---|
| XXXS | bust 28.5 in | not made | 000 | not published | not published |
| XXS | bust 30 in | 000 | 2 | bust 30.3 in, waist 24 in, hip 33.3 in | Letter XXS |
| XS | bust 31 to 32 in | 00 | 4 | bust 31.3 in, waist 24.8 in, hip 34.3 in | Letter XXS |
| S | bust 33 to 34 in | 2 | 6 | bust 33.3 in, waist 26.5 in, hip 36.3 in | Letter XS |
| M | bust 35 to 36 in | 6 | 8 | bust 35.3 in, waist 28.5 in, hip 38.3 in | Letter S |
| L | bust 37 to 38.5 in | 10 | 10 | bust 37.3 in, waist 30.5 in, hip 40.3 in | Letter M |
| XL | bust 40 to 42 in | 14 or 16 | not published | bust 40.3 in, waist 33.5 in, hip 43.3 in | Letter L |
| 1X | bust 45 to 47 in | 20 | not published | bust 45.8 in, waist 39.5 in, hip 49.3 in | Letter XXL |
| 2X | bust 49 to 51 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
- Gap size guide, read on 2026-09-18. Gap on TrueToSize