Lululemon to Marks & Spencer size
The short answer
lululemon XS is Marks & Spencer S by the two brands' own charts. 2 of 8 lululemon sizes land on a different label at Marks & Spencer.
Both brands publish the body chest each size is cut for, so every row matches a chest, not a letter.
| lululemon | lululemon builds it for | Marks & Spencer, by chart | Same label | Marks & Spencer builds it for | Marks & Spencer also prints |
|---|---|---|---|---|---|
| XS | chest 35 to 36 in | S | XS | chest 35 to 37 in | not published |
| S | chest 37 to 38 in | S or M | S | chest 35 to 37 in | not published |
| M | chest 39 to 40 in | M | M | chest 38 to 40 in | not published |
| L | chest 41 to 42 in | L | L | chest 41 to 43 in | not published |
| XL | chest 43 to 45 in | XL | XL | chest 44 to 46 in | not published |
| XXL | chest 46 to 48 in | XXL | XXL | chest 47 to 49 in | not published |
| 3XL | chest 50 to 52 in | XXXL | XXXL | chest 50 to 52 in | not published |
| 4XL | chest 53 to 55 in | 4XL | 4XL | chest 52 to 54 in | 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
- Marks & Spencer size guide, read on 2026-09-18.