Lululemon to Reiss clothing size
The short answer
lululemon M is Reiss 10 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 | Reiss, by chart | Same label | Reiss builds it for | Reiss also prints |
|---|---|---|---|---|---|
| XXXS | bust 28.5 in | not made | not published | not published | not published |
| XXS | bust 30 in | not made | not published | not published | not published |
| XS | bust 31 to 32 in | 4 or 6 | not published | bust 31 in, waist 24 in, hip 34 in | US 0 · Letter XS · FR 34 · IT 36 · AU 4 · EU (as printed) 32 |
| S | bust 33 to 34 in | 8 | not published | bust 33 in, waist 26 in, hip 36 in | US 4 · Letter S · FR 38 · IT 40 · AU 8 · EU (as printed) 36 |
| M | bust 35 to 36 in | 10 | not published | bust 35 in, waist 28 in, hip 38 in | US 6 · Letter S · FR 40 · IT 42 · AU 10 · EU (as printed) 38 |
| L | bust 37 to 38.5 in | 12 or 14 | not published | bust 37 in, waist 30 in, hip 40 in | US 8 · Letter M · FR 42 · IT 44 · AU 12 · EU (as printed) 40 |
| XL | bust 40 to 42 in | 16 | not published | bust 41 in, waist 33.5 in, hip 44 in | US 12 · Letter L · FR 46 · IT 48 · AU 16 · EU (as printed) 44 |
| 1X | bust 45 to 47 in | not made | not published | not published | 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
- Reiss size guide, read on 2026-09-18.