Sandro to Uniqlo clothing size

The short answer

Sandro 34 is Uniqlo S 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.

On 1 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.

Every Sandro size read across to Uniqlo Japan sizing. FR sizes on the left, Letter on the right.
Sandro	Sandro builds it for	Uniqlo Japan sizing, by chart	Same label	Uniqlo builds it for	Uniqlo also prints
34	bust 32 in, waist 25 in, hip 35 in	S	XS	bust 30.3 to 32.7 in, waist 24 to 26.4 in, hip 33.1 to 35.4 in	JP 7
36	bust 34 in, waist 27 in, hip 36 in	L	S	bust 33.5 to 35.8 in, waist 27.2 to 29.5 in, hip 36.2 to 38.6 in	JP 11
38	bust 35 in, waist 28 in, hip 38 in	L	M	bust 33.5 to 35.8 in, waist 27.2 to 29.5 in, hip 36.2 to 38.6 in	JP 11
40	bust 37 in, waist 30 in, hip 39 in	XL	L	bust 35.8 to 38.2 in, waist 29.5 to 31.9 in, hip 38.6 to 40.9 in	JP 13
42	bust 39 in, waist 31 in, hip 41 in	XXL	XL	bust 38.2 to 40.6 in, waist 31.9 to 34.3 in, hip 40.9 to 43.3 in	JP 15

Tinted rows change label or sit between two sizes. 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

Sandro size guide, read on 2026-09-18.
Uniqlo Japan sizing size guide, read on 2026-09-25. Uniqlo on TrueToSize

Uniqlo to Sandro