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Zella to Under Armour leggings size

The short answer

Zella XS is Under Armour XXS by the two brands' own charts. 7 of 10 Zella 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 Zella size read across to Under Armour. Letter sizes on the left, Letter on the right.
ZellaZella builds it forUnder Armour, by chartSame labelUnder Armour builds it forUnder Armour also prints
XXSwaist 24 in, hip 33.5 inXXSXXSwaist 24.5 to 25.5 in, hip 33 to 34.5 inUS numeric 00
XSwaist 25 to 26 in, hip 34.5 to 35.5 inXXSXSwaist 24.5 to 25.5 in, hip 33 to 34.5 inUS numeric 00
Swaist 27 to 28 in, hip 36.5 to 37.5 inSMnot publishedwaist 27 to 29 in, hip 36 to 38 inUS numeric 4-6
Mwaist 29 to 30 in, hip 38.5 to 39.5 inMDnot publishedwaist 29 to 31 in, hip 38 to 40 inUS numeric 8-10
Lwaist 31.5 to 33.5 in, hip 41.5 to 43.5 inLGnot publishedwaist 31 to 34 in, hip 40 to 43 inUS numeric 12-14
XLwaist 35.5 in, hip 45.5 inXLXLwaist 34 to 37 in, hip 43 to 46 inUS numeric 16
XXLwaist 38 in, hip 48.5 inXXLXXLwaist 37 to 40 in, hip 46 to 49 inUS numeric 18
2Xwaist 40.5 in, hip 51 in1X2Xwaist 39 to 43.5 in, hip 47 to 50.5 inUS numeric 16W-18W
3Xwaist 43 to 45 in, hip 53.3 to 55.5 in2X3Xwaist 43.5 to 48.5 in, hip 50.5 to 54.5 inUS numeric 20W-22W
4Xwaist 47 to 49 in, hip 57.8 to 60 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 Zella