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Convert / Women's clothing

Gap to Banana Republic clothing size

The short answer

Gap 20 is Banana Republic 18 or 20 by the two brands' own charts. 2 of 14 Gap sizes land on a different label at Banana Republic.

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

Every Gap size read across to Banana Republic. US sizes on the left, US on the right.
GapGap builds it forBanana Republic, by chartSame labelBanana Republic builds it forBanana Republic also prints
000bust 30.3 in, waist 24 in, hip 33.3 in000000bust 30.5 in, waist 24 in, hip 33.5 inLetter XXS
000bust 30.3 in, waist 24 in, hip 33.3 in000000bust 30.5 in, waist 24 in, hip 33.5 inLetter XXS
000bust 30.3 in, waist 24 in, hip 33.3 in000000bust 30.5 in, waist 24 in, hip 33.5 inLetter XXS
2bust 33.3 in, waist 26.5 in, hip 36.3 in22bust 33.5 in, waist 27 in, hip 36.5 inLetter XS
4bust 34.3 in, waist 27.5 in, hip 37.3 in44bust 34.5 in, waist 28 in, hip 37.5 inLetter S
6bust 35.3 in, waist 28.5 in, hip 38.3 in66bust 35.5 in, waist 29 in, hip 38.5 inLetter S
8bust 36.3 in, waist 29.5 in, hip 39.3 in88bust 36.5 in, waist 30 in, hip 39.5 inLetter M
10bust 37.3 in, waist 30.5 in, hip 40.3 in1010bust 37.5 in, waist 31 in, hip 40.5 inLetter M
12bust 38.8 in, waist 32 in, hip 41.8 in1212bust 39 in, waist 32.5 in, hip 42 inLetter L
14bust 40.3 in, waist 33.5 in, hip 43.3 in1414bust 40.5 in, waist 34 in, hip 43.5 inLetter L
16bust 42 in, waist 35.5 in, hip 45.3 in1616bust 42.5 in, waist 36 in, hip 45.5 inLetter XL
18bust 43.8 in, waist 37.5 in, hip 47.3 in18 or 1618bust 44.5 in, waist 38 in, hip 47.5 inLetter XL
20bust 45.8 in, waist 39.5 in, hip 49.3 in18 or 2020bust 44.5 in, waist 38 in, hip 47.5 inLetter XL
22bust 47.8 in, waist 41.5 in, hip 51.3 in20not publishedbust 47.5 in, waist 41 in, hip 50.5 inLetter XXL
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

Banana Republic to Gap