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SKIMS to Old Navy leggings size

The short answer

SKIMS 2X is Old Navy XL or XXL by the two brands' own charts. 3 of 9 SKIMS 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.

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 SKIMS size read across to Old Navy. Letter sizes on the left, Letter on the right.
SKIMSSKIMS builds it forOld Navy, by chartSame labelOld Navy builds it forOld Navy also prints
XXSwaist 23 to 24 in, hip 31 to 34 inXXSXXSwaist 24 in, hip 34.5 inUS numeric 00
XSwaist 24 to 26 in, hip 34 to 36.5 inXSXSwaist 25 to 26 in, hip 35.5 to 36.5 inUS numeric 0-2
Swaist 26.5 to 28.5 in, hip 37 to 39 inSSwaist 27 to 28 in, hip 37.5 to 38.5 inUS numeric 4-6
Mwaist 29 to 31 in, hip 39.5 to 41.5 inMMwaist 29 to 30 in, hip 39.5 to 40.5 inUS numeric 8-10
Lwaist 31.5 to 34.5 in, hip 42 to 44 inLLwaist 31.5 to 33.5 in, hip 42 to 44 inUS numeric 12-14
XLwaist 35 to 38 in, hip 44.5 to 47.5 inXLXLwaist 36.3 to 39 in, hip 46.5 to 49 inUS numeric 16-18
2Xwaist 38.5 to 41.5 in, hip 48 to 51 inXL or XXL2Xwaist 36.3 to 39 in, hip 46.5 to 49 inUS numeric 16-18
3Xwaist 42 to 45.5 in, hip 51.5 to 55 in2X3Xwaist 42 to 44.3 in, hip 51.5 to 53.8 inUS numeric 20-22
4Xwaist 46 to 49.5 in, hip 55.5 to 59 in3X4Xwaist 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 SKIMS