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Old Navy to adidas leggings size

The short answer

Old Navy XXS is adidas XS by the two brands' own charts. 5 of 10 Old Navy sizes land on a different label at adidas.

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 adidas. Letter sizes on the left, Letter on the right.
Old NavyOld Navy builds it foradidas, by chartSame labeladidas builds it foradidas also prints
XXSwaist 24 in, hip 34.5 inXS2XSwaist 24 to 26 in, hip 33.5 to 35.5 in, inseam 31 inUS numeric 0-2
XSwaist 25 to 26 in, hip 35.5 to 36.5 inXSXSwaist 24 to 26 in, hip 33.5 to 35.5 in, inseam 31 inUS numeric 0-2
Swaist 27 to 28 in, hip 37.5 to 38.5 inSSwaist 26.5 to 28.5 in, hip 36 to 38 in, inseam 31 inUS numeric 4-6
Mwaist 29 to 30 in, hip 39.5 to 40.5 inMMwaist 29 to 31 in, hip 38.5 to 40.5 in, inseam 31.5 inUS numeric 8-10
Lwaist 31.5 to 33.5 in, hip 42 to 44 inLLwaist 31.5 to 33.5 in, hip 41 to 43 in, inseam 31.5 inUS numeric 12-14
XLwaist 36.3 to 39 in, hip 46.5 to 49 in1XXLwaist 35 to 38.5 in, hip 43.5 to 47 in, inseam 31 inUS numeric 14W-16W
XXLwaist 42 in, hip 51.5 in2X2XLwaist 39 to 42.5 in, hip 47.5 to 51 in, inseam 31 inUS numeric 18W-20W
2Xwaist 42 to 44.3 in, hip 51.5 to 53.8 in3X2Xwaist 43 to 46.5 in, hip 51.5 to 55 in, inseam 30.5 inUS numeric 22W-24W
3Xwaist 46.6 to 49 in, hip 56.1 to 58.5 in4X3Xwaist 47 to 50.5 in, hip 55.5 to 59 in, inseam 30 inUS numeric 26W-28W
4Xwaist 51.5 to 54 in, hip 61 to 63.5 in4X4Xwaist 47 to 50.5 in, hip 55.5 to 59 in, inseam 30 inUS numeric 26W-28W
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

adidas to Old Navy