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Old Navy to Zella leggings size

The short answer

Old Navy XL is Zella XXL by the two brands' own charts. 4 of 9 Old Navy sizes land on a different label at Zella.

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 Old Navy size read across to Zella. Letter sizes on the left, Letter on the right.
Old NavyOld Navy builds it forZella, by chartSame labelZella builds it forZella also prints
XXSwaist 24 in, hip 34.5 inXXSXXSwaist 24 in, hip 33.5 inUS numeric 00
XSwaist 25 to 26 in, hip 35.5 to 36.5 inXSXSwaist 25 to 26 in, hip 34.5 to 35.5 inUS numeric 0-2
Swaist 27 to 28 in, hip 37.5 to 38.5 inSSwaist 27 to 28 in, hip 36.5 to 37.5 inUS numeric 4-6
Mwaist 29 to 30 in, hip 39.5 to 40.5 inMMwaist 29 to 30 in, hip 38.5 to 39.5 inUS numeric 8-10
Lwaist 31.5 to 33.5 in, hip 42 to 44 inLLwaist 31.5 to 33.5 in, hip 41.5 to 43.5 inUS numeric 12-14
XLwaist 36.3 to 39 in, hip 46.5 to 49 inXXLXLwaist 38 in, hip 48.5 inUS numeric 18
XXLwaist 42 in, hip 51.5 in3X or 2XXXLwaist 43 to 45 in, hip 53.3 to 55.5 inUS numeric 22-24
2Xwaist 42 to 44.3 in, hip 51.5 to 53.8 in3X2Xwaist 43 to 45 in, hip 53.3 to 55.5 inUS numeric 22-24
3Xwaist 46.6 to 49 in, hip 56.1 to 58.5 in4X3Xwaist 47 to 49 in, hip 57.8 to 60 inUS numeric 26-28
4Xwaist 51.5 to 54 in, hip 61 to 63.5 innot made4Xnot publishednot published
Tinted rows change label or sit between two sizes. 1 sizes have no counterpart on the Zella chart. 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

Zella to Old Navy