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Zella to Old Navy leggings size

The short answer

Zella XXL is Old Navy XL by the two brands' own charts. 4 of 10 Zella sizes land on a different label at Old Navy.

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 Old Navy. Letter sizes on the left, Letter on the right.
ZellaZella builds it forOld Navy, by chartSame labelOld Navy builds it forOld Navy also prints
XXSwaist 24 in, hip 33.5 inXXSXXSwaist 24 in, hip 34.5 inUS numeric 00
XSwaist 25 to 26 in, hip 34.5 to 35.5 inXSXSwaist 25 to 26 in, hip 35.5 to 36.5 inUS numeric 0-2
Swaist 27 to 28 in, hip 36.5 to 37.5 inSSwaist 27 to 28 in, hip 37.5 to 38.5 inUS numeric 4-6
Mwaist 29 to 30 in, hip 38.5 to 39.5 inMMwaist 29 to 30 in, hip 39.5 to 40.5 inUS numeric 8-10
Lwaist 31.5 to 33.5 in, hip 41.5 to 43.5 inLLwaist 31.5 to 33.5 in, hip 42 to 44 inUS numeric 12-14
XLwaist 35.5 in, hip 45.5 inXL or LXLwaist 36.3 to 39 in, hip 46.5 to 49 inUS numeric 16-18
XXLwaist 38 in, hip 48.5 inXLXXLwaist 36.3 to 39 in, hip 46.5 to 49 inUS numeric 16-18
2Xwaist 40.5 in, hip 51 inXXL2Xwaist 42 in, hip 51.5 inUS numeric 20
3Xwaist 43 to 45 in, hip 53.3 to 55.5 in2X3Xwaist 42 to 44.3 in, hip 51.5 to 53.8 inUS numeric 20-22
4Xwaist 47 to 49 in, hip 57.8 to 60 in3X4Xwaist 46.6 to 49 in, hip 56.1 to 58.5 inUS numeric 24-26
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

Old Navy to Zella