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Convert / Women's clothing

Reiss to Uniqlo clothing size

The short answer

Reiss 4 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 5 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 Reiss size read across to Uniqlo Japan sizing. UK sizes on the left, Letter on the right.
ReissReiss builds it forUniqlo Japan sizing, by chartSame labelUniqlo builds it forUniqlo also prints
4bust 31 in, waist 24 in, hip 34 inSXSbust 30.3 to 32.7 in, waist 24 to 26.4 in, hip 33.1 to 35.4 inJP 7
6bust 32 in, waist 25 in, hip 35 inSXSbust 30.3 to 32.7 in, waist 24 to 26.4 in, hip 33.1 to 35.4 inJP 7
8bust 33 in, waist 26 in, hip 36 inMSbust 31.9 to 34.3 in, waist 25.6 to 28 in, hip 34.7 to 37 inJP 9
10bust 35 in, waist 28 in, hip 38 inLSbust 33.5 to 35.8 in, waist 27.2 to 29.5 in, hip 36.2 to 38.6 inJP 11
12bust 37 in, waist 30 in, hip 40 inXLMbust 35.8 to 38.2 in, waist 29.5 to 31.9 in, hip 38.6 to 40.9 inJP 13
14bust 39 in, waist 31.5 in, hip 42 inXXLMbust 38.2 to 40.6 in, waist 31.9 to 34.3 in, hip 40.9 to 43.3 inJP 15
16bust 41 in, waist 33.5 in, hip 44 in3XLLbust 40.6 to 42.9 in, waist 34.3 to 36.6 in, hip 43.3 to 45.7 inJP 17
18bust 43 in, waist 36 in, hip 46.5 in3XLLbust 40.6 to 42.9 in, waist 34.3 to 36.6 in, hip 43.3 to 45.7 inJP 17
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

Uniqlo to Reiss