Farm Rio to Reformation clothing size

The short answer

Farm Rio M is Reformation M by the two brands' own charts. 0 of 5 Farm Rio sizes land on a different label at Reformation.

Both brands publish the body bust each size is cut for, so every row matches a bust, not a letter or a number.

Every Farm Rio size read across to Reformation. Letter sizes on the left, Letter on the right.
Farm Rio	Farm Rio builds it for	Reformation, by chart	Same label	Reformation builds it for	Reformation also prints
XXS	bust 30 to 31 in, waist 24 to 25 in, hip 33 to 34 in	not made	not published	not published	not published
XS	bust 32 to 33 in, waist 26 to 27 in, hip 35 to 36 in	XS	XS	bust 33 in, waist 25 in, hip 36 in	US 0
S	bust 34 to 35 in, waist 28 to 29 in, hip 37 to 38 in	S	S	bust 35 in, waist 27 in, hip 38 in	US 2/4
M	bust 36 to 37 in, waist 30 to 31 in, hip 39 to 40 in	M	M	bust 37 in, waist 29 in, hip 40 in	US 6/8
L	bust 38 to 40 in, waist 32 to 34 in, hip 41 to 43 in	L	L	bust 39.5 in, waist 31.5 in, hip 42.5 in	US 10
XL	bust 41 to 44 in, waist 35 to 37 in, hip 44 to 46 in	XL	XL	bust 41.5 in, waist 33.5 in, hip 44.5 in	US 12

Tinted rows change label or sit between two sizes. 1 sizes have no counterpart on the Reformation 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

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

Reformation to Farm Rio