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Old Navy to Fabletics leggings size

The short answer

Old Navy XL is Fabletics XXL/1X or XL by the two brands' own charts. 5 of 10 Old Navy sizes land on a different label at Fabletics.

Both brands publish the body waist each size is cut for, so every row matches a waist, not a tag.

On 2 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 Fabletics. Letter sizes on the left, Letter on the right.
Old NavyOld Navy builds it forFabletics, by chartSame labelFabletics builds it forFabletics also prints
XXSwaist 24 in, hip 34.5 inXXSXXSwaist 24 to 25 in, hip 33 to 35 inUS numeric 00
XSwaist 25 to 26 in, hip 35.5 to 36.5 inXSXSwaist 25.5 to 26.5 in, hip 36 to 37 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 30 in, hip 39.5 to 40.5 inMMwaist 29 to 31 in, hip 39 to 41 inUS numeric 8-10
Lwaist 31.5 to 33.5 in, hip 42 to 44 inLLwaist 32 to 34 in, hip 42 to 44 inUS numeric 12-14
XLwaist 36.3 to 39 in, hip 46.5 to 49 inXXL/1X or XLXLwaist 38 to 41 in, hip 48 to 51 inUS numeric 16-18
XXLwaist 42 in, hip 51.5 in2XXXL/1Xwaist 41 to 43 in, hip 51 to 53 inUS numeric 20-22
2Xwaist 42 to 44.3 in, hip 51.5 to 53.8 in3X2Xwaist 43 to 45 in, hip 53 to 55 inUS numeric 24-26
3Xwaist 46.6 to 49 in, hip 56.1 to 58.5 in5X3Xwaist 47 to 49 in, hip 57 to 59 inUS numeric 32-34
4Xwaist 51.5 to 54 in, hip 61 to 63.5 in6X4Xwaist 49 to 51 in, hip 59 to 61 inUS numeric 36-38
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

Fabletics to Old Navy