Whistles to Boden clothing size

The short answer

Whistles 14 is Boden 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 Whistles size read across to Boden. UK sizes on the left, US on the right.
Whistles	Whistles builds it for	Boden, by chart	Same label	Boden builds it for	Boden 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	not made	not published	not published	not published
08	bust 32 in, waist 25.5 in, hip 36.5 in	2	not published	bust 32 to 33 in, waist 25 to 26 in, hip 34 to 35 in	Letter XS
10	bust 34 in, waist 27.5 in, hip 38.5 in	4	not published	bust 33.3 to 34 in, waist 26.3 to 27 in, hip 35.3 to 36 in	Letter S
12	bust 36 in, waist 29.5 in, hip 40.5 in	8	not published	bust 35.5 to 37 in, waist 28.5 to 30 in, hip 37.5 to 39 in	Letter M
14	bust 38 in, waist 31.5 in, hip 42.5 in	10	not published	bust 37.5 to 39 in, waist 30.5 to 32 in, hip 39.5 to 41 in	Letter M
16	bust 40 in, waist 33.5 in, hip 44.5 in	12	not published	bust 39.5 to 41 in, waist 32.5 to 34 in, hip 41.5 to 43 in	Letter L
18	bust 42.5 in, waist 35.5 in, hip 46.5 in	14	not published	bust 41.5 to 43 in, waist 34.5 to 36 in, hip 43.5 to 45 in	Letter L
20	bust 45 in, waist 38 in, hip 49 in	16	not published	bust 43.5 to 45 in, waist 36.5 to 38 in, hip 45.5 to 47 in	Letter XL

Tinted rows change label or sit between two sizes. 2 sizes have no counterpart on the Boden 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.
Boden size guide, read on 2026-09-18.

Boden to Whistles