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AYBL to Old Navy leggings size

The short answer

AYBL XL is Old Navy L or XL by the two brands' own charts. 2 of 7 AYBL 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 AYBL size read across to Old Navy. Letter sizes on the left, Letter on the right.
AYBLAYBL builds it forOld Navy, by chartSame labelOld Navy builds it forOld Navy also prints
XXSwaist 23 to 24 in, hip 33.5 to 35 inXXSXXSwaist 24 in, hip 34.5 inUS numeric 00
XSwaist 24 to 26.5 in, hip 35 to 37 inXSXSwaist 25 to 26 in, hip 35.5 to 36.5 inUS numeric 0-2
Swaist 26.5 to 29 in, hip 37 to 39.5 inSSwaist 27 to 28 in, hip 37.5 to 38.5 inUS numeric 4-6
Mwaist 29 to 31 in, hip 39.5 to 42 inMMwaist 29 to 30 in, hip 39.5 to 40.5 inUS numeric 8-10
Lwaist 31 to 33.5 in, hip 42 to 44.5 inLLwaist 31.5 to 33.5 in, hip 42 to 44 inUS numeric 12-14
XLwaist 33.5 to 36 in, hip 44.5 to 46.5 inL or XLXLwaist 31.5 to 33.5 in, hip 42 to 44 inUS numeric 12-14
XXLwaist 36 to 38.5 in, hip 46.5 to 49 inXLXXLwaist 36.3 to 39 in, hip 46.5 to 49 inUS numeric 16-18
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 AYBL