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Old Navy to SKIMS leggings size

The short answer

Old Navy XXL is SKIMS 3X by the two brands' own charts. 3 of 10 Old Navy sizes land on a different label at SKIMS.

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

Every Old Navy size read across to SKIMS. Letter sizes on the left, Letter on the right.
Old NavyOld Navy builds it forSKIMS, by chartSame labelSKIMS builds it forSKIMS also prints
XXSwaist 24 in, hip 34.5 inXXSXXSwaist 23 to 24 in, hip 31 to 34 inUS numeric 00
XSwaist 25 to 26 in, hip 35.5 to 36.5 inXSXSwaist 24 to 26 in, hip 34 to 36.5 inUS numeric 0-2
Swaist 27 to 28 in, hip 37.5 to 38.5 inSSwaist 26.5 to 28.5 in, hip 37 to 39 inUS numeric 4-6
Mwaist 29 to 30 in, hip 39.5 to 40.5 inMMwaist 29 to 31 in, hip 39.5 to 41.5 inUS numeric 8-10
Lwaist 31.5 to 33.5 in, hip 42 to 44 inLLwaist 31.5 to 34.5 in, hip 42 to 44 inUS numeric 12-14
XLwaist 36.3 to 39 in, hip 46.5 to 49 inXLXLwaist 35 to 38 in, hip 44.5 to 47.5 inUS numeric 16
XXLwaist 42 in, hip 51.5 in3Xnot publishedwaist 42 to 45.5 in, hip 51.5 to 55 inUS numeric 22-24
2Xwaist 42 to 44.3 in, hip 51.5 to 53.8 in3X2Xwaist 42 to 45.5 in, hip 51.5 to 55 inUS numeric 22-24
3Xwaist 46.6 to 49 in, hip 56.1 to 58.5 in4X3Xwaist 46 to 49.5 in, hip 55.5 to 59 inUS numeric 26-28
4Xwaist 51.5 to 54 in, hip 61 to 63.5 in4X4Xwaist 46 to 49.5 in, hip 55.5 to 59 inUS numeric 26-28
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

SKIMS to Old Navy