Marks & Spencer to Patagonia size
The short answer
Marks & Spencer XS is Patagonia XXS by the two brands' own charts. 7 of 8 Marks & Spencer sizes land on a different label at Patagonia.
Both brands publish the body chest each size is cut for, so every row matches a chest, not a letter.
| Marks & Spencer | Marks & Spencer builds it for | Patagonia, by chart | Same label | Patagonia builds it for | Patagonia also prints |
|---|---|---|---|---|---|
| XS | chest 32 to 34 in | XXS | XS | chest 33 in, hip 32 in, sleeve 30 in | not published |
| S | chest 35 to 37 in | XS or S | S | chest 35 in, hip 34 in, sleeve 32 in | not published |
| M | chest 38 to 40 in | M | M | chest 40 in, hip 39 in, sleeve 34 in | not published |
| L | chest 41 to 43 in | M or L | L | chest 40 in, hip 39 in, sleeve 34 in | not published |
| XL | chest 44 to 46 in | L | XL | chest 44 in, hip 43 in, sleeve 35 in | not published |
| XXL | chest 47 to 49 in | XL | XXL | chest 47 in, hip 46 in, sleeve 36 in | not published |
| XXXL | chest 50 to 52 in | XXL | XXXL | chest 50 in, hip 49 in, sleeve 37 in | not published |
| 4XL | chest 52 to 54 in | XXL or XXXL | not published | chest 50 in, hip 49 in, sleeve 37 in | 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
- Marks & Spencer size guide, read on 2026-09-18.
- Patagonia size guide, read on 2026-09-18.