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SKIMS to Under Armour leggings size

The short answer

SKIMS XS is Under Armour XXS by the two brands' own charts. 7 of 9 SKIMS sizes land on a different label at Under Armour.

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

Every SKIMS size read across to Under Armour. Letter sizes on the left, Letter on the right.
SKIMSSKIMS builds it forUnder Armour, by chartSame labelUnder Armour builds it forUnder Armour also prints
XXSwaist 23 to 24 in, hip 31 to 34 inXXSXXSwaist 24.5 to 25.5 in, hip 33 to 34.5 inUS numeric 00
XSwaist 24 to 26 in, hip 34 to 36.5 inXXSXSwaist 24.5 to 25.5 in, hip 33 to 34.5 inUS numeric 00
Swaist 26.5 to 28.5 in, hip 37 to 39 inSMnot publishedwaist 27 to 29 in, hip 36 to 38 inUS numeric 4-6
Mwaist 29 to 31 in, hip 39.5 to 41.5 inMDnot publishedwaist 29 to 31 in, hip 38 to 40 inUS numeric 8-10
Lwaist 31.5 to 34.5 in, hip 42 to 44 inLGnot publishedwaist 31 to 34 in, hip 40 to 43 inUS numeric 12-14
XLwaist 35 to 38 in, hip 44.5 to 47.5 inXLXLwaist 34 to 37 in, hip 43 to 46 inUS numeric 16
2Xwaist 38.5 to 41.5 in, hip 48 to 51 in1X2Xwaist 39 to 43.5 in, hip 47 to 50.5 inUS numeric 16W-18W
3Xwaist 42 to 45.5 in, hip 51.5 to 55 in2X3Xwaist 43.5 to 48.5 in, hip 50.5 to 54.5 inUS numeric 20W-22W
4Xwaist 46 to 49.5 in, hip 55.5 to 59 in2Xnot publishedwaist 43.5 to 48.5 in, hip 50.5 to 54.5 inUS numeric 20W-22W
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

Under Armour to SKIMS