MUJI to Arc'teryx clothing size
The short answer
MUJI M is Arc'teryx XS by the two brands' own charts. 4 of 4 MUJI sizes land on a different label at Arc'teryx.
Both brands publish the body bust each size is cut for, so every row matches a bust, not a letter or a number.
On 4 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.
| MUJI Japan sizing | MUJI builds it for | Arc'teryx, by chart | Same label | Arc'teryx builds it for | Arc'teryx also prints |
|---|---|---|---|---|---|
| XS | bust 28.7 to 30.3 in, waist 22.1 to 23.6 in, hip 31.9 to 33.5 in | not made | XS | not published | not published |
| S | bust 29.5 to 31.9 in, waist 22.8 to 25.2 in, hip 32.7 to 35 in | not made | S | not published | not published |
| M | bust 31.5 to 33.9 in, waist 24.8 to 27.2 in, hip 34.7 to 37 in | XS | M | bust 33.1 in, waist 26.8 in, hip 36.2 in | not published |
| L | bust 33.5 to 35.8 in, waist 26.8 to 29.1 in, hip 36.6 to 39 in | S | L | bust 35 in, waist 28.7 in, hip 38.2 in | not published |
| XL | bust 35.4 to 37.8 in, waist 28.7 to 31.1 in, hip 38.6 to 40.9 in | M | XL | bust 37 in, waist 30.7 in, hip 40.2 in | not published |
| XXL | bust 37.4 to 39.8 in, waist 30.7 to 33.1 in, hip 40.6 to 42.9 in | M or L | XXL | bust 37 in, waist 30.7 in, hip 40.2 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
- MUJI Japan sizing size guide, read on 2026-09-25.
- Arc'teryx size guide, read on 2026-09-18.