Reformation to Sandro clothing size

The short answer

Reformation M is Sandro 40 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 Reformation size read across to Sandro. Letter sizes on the left, FR on the right.
Reformation	Reformation builds it for	Sandro, by chart	Same label	Sandro builds it for	Sandro also prints
XS	bust 33 in, waist 25 in, hip 36 in	34 or 36	not published	bust 32 in, waist 25 in, hip 35 in	US 2 · Letter XS · UK 6 · DE 32 · IT 38
S	bust 35 in, waist 27 in, hip 38 in	38	not published	bust 35 in, waist 28 in, hip 38 in	US 6 · Letter M · UK 10 · DE 36 · IT 42
M	bust 37 in, waist 29 in, hip 40 in	40	not published	bust 37 in, waist 30 in, hip 39 in	US 8 · Letter L · UK 12 · DE 38 · IT 44
L	bust 39.5 in, waist 31.5 in, hip 42.5 in	42	not published	bust 39 in, waist 31 in, hip 41 in	US 10 · Letter XL · UK 14 · DE 40 · IT 46
XL	bust 41.5 in, waist 33.5 in, hip 44.5 in	not made	not published	not published	not published
1X	bust 45 in, waist 37.5 in, hip 47.5 in	not made	not published	not published	not published
2X	bust 48 in, waist 40.5 in, hip 50.5 in	not made	not published	not published	not published
3X	bust 51 in, waist 43.5 in, hip 53.5 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 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

Reformation size guide, read on 2026-09-18. Reformation on TrueToSize
Sandro size guide, read on 2026-09-18.

Sandro to Reformation