Sandro to Reformation clothing size

The short answer

Sandro 36 is Reformation XS or S 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 Reformation. FR sizes on the left, Letter on the right.
Sandro	Sandro builds it for	Reformation, by chart	Same label	Reformation builds it for	Reformation also prints
34	bust 32 in, waist 25 in, hip 35 in	XS	XS	bust 33 in, waist 25 in, hip 36 in	US 0
36	bust 34 in, waist 27 in, hip 36 in	XS or S	S	bust 33 in, waist 25 in, hip 36 in	US 0
38	bust 35 in, waist 28 in, hip 38 in	S	M	bust 35 in, waist 27 in, hip 38 in	US 2/4
40	bust 37 in, waist 30 in, hip 39 in	M	L	bust 37 in, waist 29 in, hip 40 in	US 6/8
42	bust 39 in, waist 31 in, hip 41 in	L	XL	bust 39.5 in, waist 31.5 in, hip 42.5 in	US 10

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

Reformation to Sandro