Lululemon to Whistles clothing size
The short answer
lululemon M is Whistles 12 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.
| lululemon | lululemon builds it for | Whistles, by chart | Same label | Whistles builds it for | Whistles also prints |
|---|---|---|---|---|---|
| XXXS | bust 28.5 in | not made | not published | not published | not published |
| XXS | bust 30 in | 04 | not published | bust 30 in, waist 23.5 in, hip 34.5 in | not published |
| XS | bust 31 to 32 in | 06 or 08 | not published | bust 31 in, waist 24.5 in, hip 35.5 in | not published |
| S | bust 33 to 34 in | 10 | not published | bust 34 in, waist 27.5 in, hip 38.5 in | not published |
| M | bust 35 to 36 in | 12 | not published | bust 36 in, waist 29.5 in, hip 40.5 in | not published |
| L | bust 37 to 38.5 in | 14 | not published | bust 38 in, waist 31.5 in, hip 42.5 in | not published |
| XL | bust 40 to 42 in | 16 or 18 | not published | bust 40 in, waist 33.5 in, hip 44.5 in | not published |
| 1X | bust 45 to 47 in | 20 | not published | bust 45 in, waist 38 in, hip 49 in | not published |
| 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
- Whistles size guide, read on 2026-09-18.