TrueToSize

Convert / Women's clothing

Under Armour to Gap clothing size

The short answer

Under Armour XS is Gap 2 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 Under Armour size read across to Gap. Letter sizes on the left, US on the right.
Under ArmourUnder Armour builds it forGap, by chartSame labelGap builds it forGap also prints
XXSbust 31 to 32.5 in, waist 24.5 to 25.5 in00 or 0000bust 31.3 in, waist 24.8 in, hip 34.3 inLetter XXS
XSbust 32.5 to 33.5 in, waist 25.5 to 27 in2not publishedbust 33.3 in, waist 26.5 in, hip 36.3 inLetter XS
SMbust 33.5 to 36 in, waist 27 to 29 in4 or 6not publishedbust 34.3 in, waist 27.5 in, hip 37.3 inLetter S
MDbust 36 to 38 in, waist 29 to 31 in10not publishedbust 37.3 in, waist 30.5 in, hip 40.3 inLetter M
LGbust 38 to 41 in, waist 31 to 34 in12 or 14not publishedbust 38.8 in, waist 32 in, hip 41.8 inLetter L
XLbust 41 to 44 in, waist 34 to 37 in1616bust 42 in, waist 35.5 in, hip 45.3 inLetter XL
XXLbust 44 to 47 in, waist 37 to 40 in2018bust 45.8 in, waist 39.5 in, hip 49.3 inLetter XXL
3XLbust 47 to 50 in, waist 40 to 43 in2220bust 47.8 in, waist 41.5 in, hip 51.3 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

Gap to Under Armour