MUJI to Reiss clothing size

The short answer

MUJI L 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.

Every MUJI Japan sizing size read across to Reiss. Letter sizes on the left, UK on the right.
MUJI Japan sizing	MUJI builds it for	Reiss, by chart	Same label	Reiss builds it for	Reiss 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	not published	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	4	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
M	bust 31.5 to 33.9 in, waist 24.8 to 27.2 in, hip 34.7 to 37 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
L	bust 33.5 to 35.8 in, waist 26.8 to 29.1 in, hip 36.6 to 39 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
XL	bust 35.4 to 37.8 in, waist 28.7 to 31.1 in, hip 38.6 to 40.9 in	12	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
XXL	bust 37.4 to 39.8 in, waist 30.7 to 33.1 in, hip 40.6 to 42.9 in	14	not published	bust 39 in, waist 31.5 in, hip 42 in	US 10 · Letter M · FR 44 · IT 46 · AU 14 · EU (as printed) 42

Tinted rows change label or sit between two sizes. 1 sizes have no counterpart on the Reiss chart. Read from the two charts only; no formula and no averaging.

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.

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Sources

MUJI Japan sizing size guide, read on 2026-09-25.
Reiss size guide, read on 2026-09-18.

Reiss to MUJI