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Convert / Women's clothing

Whistles to Uniqlo clothing size

The short answer

Whistles 12 is Uniqlo XL 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 Whistles size read across to Uniqlo Japan sizing. UK sizes on the left, Letter on the right.
WhistlesWhistles builds it forUniqlo Japan sizing, by chartSame labelUniqlo builds it forUniqlo also prints
04bust 30 in, waist 23.5 in, hip 34.5 inXSnot publishedbust 28.7 to 31.1 in, waist 22.4 to 24.8 in, hip 31.5 to 33.9 inJP 5
06bust 31 in, waist 24.5 in, hip 35.5 inSnot publishedbust 30.3 to 32.7 in, waist 24 to 26.4 in, hip 33.1 to 35.4 inJP 7
08bust 32 in, waist 25.5 in, hip 36.5 inSnot publishedbust 30.3 to 32.7 in, waist 24 to 26.4 in, hip 33.1 to 35.4 inJP 7
10bust 34 in, waist 27.5 in, hip 38.5 inLnot publishedbust 33.5 to 35.8 in, waist 27.2 to 29.5 in, hip 36.2 to 38.6 inJP 11
12bust 36 in, waist 29.5 in, hip 40.5 inXLnot publishedbust 35.8 to 38.2 in, waist 29.5 to 31.9 in, hip 38.6 to 40.9 inJP 13
14bust 38 in, waist 31.5 in, hip 42.5 inXLnot publishedbust 35.8 to 38.2 in, waist 29.5 to 31.9 in, hip 38.6 to 40.9 inJP 13
16bust 40 in, waist 33.5 in, hip 44.5 inXXLnot publishedbust 38.2 to 40.6 in, waist 31.9 to 34.3 in, hip 40.9 to 43.3 inJP 15
18bust 42.5 in, waist 35.5 in, hip 46.5 in3XLnot publishedbust 40.6 to 42.9 in, waist 34.3 to 36.6 in, hip 43.3 to 45.7 inJP 17
20bust 45 in, waist 38 in, hip 49 innot madenot publishednot publishednot published
Tinted rows change label or sit between two sizes. 1 sizes have no counterpart on the Uniqlo 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

Uniqlo to Whistles