Reiss to Sandro clothing size

The short answer

Reiss 6 is Sandro 34 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 1 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 Sandro. UK sizes on the left, FR on the right.
Reiss	Reiss builds it for	Sandro, by chart	Same label	Sandro builds it for	Sandro also prints
4	bust 31 in, waist 24 in, hip 34 in	34	34	bust 32 in, waist 25 in, hip 35 in	US 2 · Letter XS · UK 6 · DE 32 · IT 38
6	bust 32 in, waist 25 in, hip 35 in	34	36	bust 32 in, waist 25 in, hip 35 in	US 2 · Letter XS · UK 6 · DE 32 · IT 38
8	bust 33 in, waist 26 in, hip 36 in	34 or 36	38	bust 32 in, waist 25 in, hip 35 in	US 2 · Letter XS · UK 6 · DE 32 · IT 38
10	bust 35 in, waist 28 in, hip 38 in	38	40	bust 35 in, waist 28 in, hip 38 in	US 6 · Letter M · UK 10 · DE 36 · IT 42
12	bust 37 in, waist 30 in, hip 40 in	40	42	bust 37 in, waist 30 in, hip 39 in	US 8 · Letter L · UK 12 · DE 38 · IT 44
14	bust 39 in, waist 31.5 in, hip 42 in	42	not published	bust 39 in, waist 31 in, hip 41 in	US 10 · Letter XL · UK 14 · DE 40 · IT 46
16	bust 41 in, waist 33.5 in, hip 44 in	not made	not published	not published	not published
18	bust 43 in, waist 36 in, hip 46.5 in	not made	not published	not published	not published

Tinted rows change label or sit between two sizes. 2 sizes have no counterpart on the Sandro 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

Reiss size guide, read on 2026-09-18.
Sandro size guide, read on 2026-09-18.

Sandro to Reiss