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Under Armour to SKIMS leggings size

The short answer

Under Armour XXS is SKIMS XS by the two brands' own charts. 9 of 11 Under Armour sizes land on a different label at SKIMS.

Both brands publish the body waist each size is cut for, so every row matches a waist, not a tag.

On 1 sizes the charts land two or more sizes from the same label. Brands do not measure the body the same way, so on those rows treat the chart answer and the same label as the two ends of a range.

Every Under Armour size read across to SKIMS. Letter sizes on the left, Letter on the right.
Under ArmourUnder Armour builds it forSKIMS, by chartSame labelSKIMS builds it forSKIMS also prints
XXSwaist 24.5 to 25.5 in, hip 33 to 34.5 inXSXXSwaist 24 to 26 in, hip 34 to 36.5 inUS numeric 0-2
XSwaist 25.5 to 27 in, hip 34.5 to 36 inXSXSwaist 24 to 26 in, hip 34 to 36.5 inUS numeric 0-2
SMwaist 27 to 29 in, hip 36 to 38 inSnot publishedwaist 26.5 to 28.5 in, hip 37 to 39 inUS numeric 4-6
MDwaist 29 to 31 in, hip 38 to 40 inMnot publishedwaist 29 to 31 in, hip 39.5 to 41.5 inUS numeric 8-10
LGwaist 31 to 34 in, hip 40 to 43 inLnot publishedwaist 31.5 to 34.5 in, hip 42 to 44 inUS numeric 12-14
XLwaist 34 to 37 in, hip 43 to 46 inXLXLwaist 35 to 38 in, hip 44.5 to 47.5 inUS numeric 16
XXLwaist 37 to 40 in, hip 46 to 49 in2Xnot publishedwaist 38.5 to 41.5 in, hip 48 to 51 inUS numeric 18-20
3XLwaist 40 to 43 in, hip 49 to 52 in2Xnot publishedwaist 38.5 to 41.5 in, hip 48 to 51 inUS numeric 18-20
1Xwaist 39 to 43.5 in, hip 47 to 50.5 in2Xnot publishedwaist 38.5 to 41.5 in, hip 48 to 51 inUS numeric 18-20
2Xwaist 43.5 to 48.5 in, hip 50.5 to 54.5 in4X2Xwaist 46 to 49.5 in, hip 55.5 to 59 inUS numeric 26-28
3Xwaist 48.5 to 53 in, hip 54.5 to 58 in4X3Xwaist 46 to 49.5 in, hip 55.5 to 59 inUS numeric 26-28
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. People who own both brands describe a fit, and their answer ranks above this table once five of them stand behind it. Pick your size in the converter to see whether there are enough yet.

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Sources

SKIMS to Under Armour