Whistles to DESCENTE clothing size

The short answer

Whistles 10 is DESCENTE L 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 DESCENTE Japan sizing. UK sizes on the left, Letter on the right.
Whistles	Whistles builds it for	DESCENTE Japan sizing, by chart	Same label	DESCENTE builds it for	DESCENTE also prints
04	bust 30 in, waist 23.5 in, hip 34.5 in	not made	not published	not published	not published
06	bust 31 in, waist 24.5 in, hip 35.5 in	S	not published	bust 30.7 to 32.3 in, waist 23.2 to 24.8 in	not published
08	bust 32 in, waist 25.5 in, hip 36.5 in	S	not published	bust 30.7 to 32.3 in, waist 23.2 to 24.8 in	not published
10	bust 34 in, waist 27.5 in, hip 38.5 in	L	not published	bust 33.1 to 34.7 in, waist 25.6 to 27.2 in	not published
12	bust 36 in, waist 29.5 in, hip 40.5 in	XO	not published	bust 35.4 to 37 in, waist 28 to 29.5 in	not published
14	bust 38 in, waist 31.5 in, hip 42.5 in	2XO(XA)	not published	bust 36.6 to 38.2 in, waist 29.1 to 30.7 in	not published
16	bust 40 in, waist 33.5 in, hip 44.5 in	not made	not published	not published	not published
18	bust 42.5 in, waist 35.5 in, hip 46.5 in	not made	not published	not published	not published
20	bust 45 in, waist 38 in, hip 49 in	not made	not published	not published	not published

Tinted rows change label or sit between two sizes. 4 sizes have no counterpart on the DESCENTE 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

Whistles size guide, read on 2026-09-18.
DESCENTE Japan sizing size guide, read on 2026-09-25.

DESCENTE to Whistles