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Old Navy to Smartwool leggings size

The short answer

Old Navy M is Smartwool S by the two brands' own charts. 3 of 6 Old Navy sizes land on a different label at Smartwool.

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 Smartwool. Letter sizes on the left, Letter on the right.
Old NavyOld Navy builds it forSmartwool, by chartSame labelSmartwool builds it forSmartwool also prints
XXSwaist 24 in, hip 34.5 innot madenot publishednot publishednot published
XSwaist 25 to 26 in, hip 35.5 to 36.5 innot madenot publishednot publishednot published
Swaist 27 to 28 in, hip 37.5 to 38.5 inSSwaist 29 to 31 in, hip 36 to 38 innot published
Mwaist 29 to 30 in, hip 39.5 to 40.5 inSMwaist 29 to 31 in, hip 36 to 38 innot published
Lwaist 31.5 to 33.5 in, hip 42 to 44 inMLwaist 32 to 34 in, hip 39 to 41 innot published
XLwaist 36.3 to 39 in, hip 46.5 to 49 inXL or LXLwaist 38 to 40 in, hip 45 to 48 innot published
XXLwaist 42 in, hip 51.5 inXXLXXLwaist 41 to 44 in, hip 49 to 51 innot published
2Xwaist 42 to 44.3 in, hip 51.5 to 53.8 inXXLnot publishedwaist 41 to 44 in, hip 49 to 51 innot published
3Xwaist 46.6 to 49 in, hip 56.1 to 58.5 innot madenot publishednot publishednot published
4Xwaist 51.5 to 54 in, hip 61 to 63.5 innot madenot publishednot publishednot published
Tinted rows change label or sit between two sizes. 4 sizes have no counterpart on the Smartwool chart. 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

Smartwool to Old Navy