Sandro to Whistles clothing size

The short answer

Sandro 34 is Whistles 08 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 Sandro size read across to Whistles. FR sizes on the left, UK on the right.
Sandro	Sandro builds it for	Whistles, by chart	Same label	Whistles builds it for	Whistles also prints
34	bust 32 in, waist 25 in, hip 35 in	08	06	bust 32 in, waist 25.5 in, hip 36.5 in	not published
36	bust 34 in, waist 27 in, hip 36 in	10	08	bust 34 in, waist 27.5 in, hip 38.5 in	not published
38	bust 35 in, waist 28 in, hip 38 in	10 or 12	10	bust 34 in, waist 27.5 in, hip 38.5 in	not published
40	bust 37 in, waist 30 in, hip 39 in	12 or 14	12	bust 36 in, waist 29.5 in, hip 40.5 in	not published
42	bust 39 in, waist 31 in, hip 41 in	14 or 16	14	bust 38 in, waist 31.5 in, hip 42.5 in	not published

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.
Whistles size guide, read on 2026-09-18.

Whistles to Sandro