Farm Rio to Gap clothing size

The short answer

Farm Rio XXS is Gap 000 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 Farm Rio size read across to Gap. Letter sizes on the left, US on the right.
Farm Rio	Farm Rio builds it for	Gap, by chart	Same label	Gap builds it for	Gap also prints
XXS	bust 30 to 31 in, waist 24 to 25 in, hip 33 to 34 in	000	000	bust 30.3 in, waist 24 in, hip 33.3 in	Letter XXS
XS	bust 32 to 33 in, waist 26 to 27 in, hip 35 to 36 in	0	not published	bust 32.3 in, waist 25.5 in, hip 35.3 in	Letter XS
S	bust 34 to 35 in, waist 28 to 29 in, hip 37 to 38 in	4	not published	bust 34.3 in, waist 27.5 in, hip 37.3 in	Letter S
M	bust 36 to 37 in, waist 30 to 31 in, hip 39 to 40 in	8	not published	bust 36.3 in, waist 29.5 in, hip 39.3 in	Letter M
L	bust 38 to 40 in, waist 32 to 34 in, hip 41 to 43 in	12	not published	bust 38.8 in, waist 32 in, hip 41.8 in	Letter L
XL	bust 41 to 44 in, waist 35 to 37 in, hip 44 to 46 in	16	16	bust 42 in, waist 35.5 in, hip 45.3 in	Letter XL

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

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

Gap to Farm Rio