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Fabletics to Old Navy leggings size

The short answer

Fabletics XXL/1X is Old Navy XL or XXL by the two brands' own charts. 6 of 12 Fabletics 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 Fabletics size read across to Old Navy. Letter sizes on the left, Letter on the right.
FableticsFabletics builds it forOld Navy, by chartSame labelOld Navy builds it forOld Navy also prints
XXSwaist 24 to 25 in, hip 33 to 35 inXXSXXSwaist 24 in, hip 34.5 inUS numeric 00
XSwaist 25.5 to 26.5 in, hip 36 to 37 inXSXSwaist 25 to 26 in, hip 35.5 to 36.5 inUS numeric 0-2
Swaist 27 to 28 in, hip 37.5 to 38.5 inSSwaist 27 to 28 in, hip 37.5 to 38.5 inUS numeric 4-6
Mwaist 29 to 31 in, hip 39 to 41 inMMwaist 29 to 30 in, hip 39.5 to 40.5 inUS numeric 8-10
Lwaist 32 to 34 in, hip 42 to 44 inLLwaist 31.5 to 33.5 in, hip 42 to 44 inUS numeric 12-14
XLwaist 35 to 37 in, hip 45 to 47 inXLXLwaist 36.3 to 39 in, hip 46.5 to 49 inUS numeric 16-18
XXL/1Xwaist 38 to 41 in, hip 48 to 51 inXL or XXLnot publishedwaist 36.3 to 39 in, hip 46.5 to 49 inUS numeric 16-18
2Xwaist 41 to 43 in, hip 51 to 53 inXXL2Xwaist 42 in, hip 51.5 inUS numeric 20
3Xwaist 43 to 45 in, hip 53 to 55 in2X3Xwaist 42 to 44.3 in, hip 51.5 to 53.8 inUS numeric 20-22
4Xwaist 45 to 47 in, hip 55 to 57 in3X or 2X4Xwaist 46.6 to 49 in, hip 56.1 to 58.5 inUS numeric 24-26
5Xwaist 47 to 49 in, hip 57 to 59 in3Xnot publishedwaist 46.6 to 49 in, hip 56.1 to 58.5 inUS numeric 24-26
6Xwaist 49 to 51 in, hip 59 to 61 in3X or 4Xnot publishedwaist 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 Fabletics