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Old Navy to Decathlon leggings size

The short answer

Old Navy XXS is Decathlon 2XS by the two brands' own charts. 2 of 6 Old Navy sizes land on a different label at Decathlon.

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 Decathlon. Letter sizes on the left, Letter on the right.
Old NavyOld Navy builds it forDecathlon, by chartSame labelDecathlon builds it forDecathlon also prints
XXSwaist 24 in, hip 34.5 in2XS2XSwaist 23.6 to 24.8 in, hip 31.1 to 33.5 innot published
XSwaist 25 to 26 in, hip 35.5 to 36.5 inXSXSwaist 25.2 to 26.8 in, hip 33.5 to 35.4 innot published
Swaist 27 to 28 in, hip 37.5 to 38.5 inSSwaist 27.2 to 28.7 in, hip 35.4 to 37.8 innot published
Mwaist 29 to 30 in, hip 39.5 to 40.5 inMMwaist 29.1 to 31.1 in, hip 37.8 to 40.2 innot published
Lwaist 31.5 to 33.5 in, hip 42 to 44 inLLwaist 31.5 to 33.9 in, hip 40.2 to 42.5 innot published
XLwaist 36.3 to 39 in, hip 46.5 to 49 in2XLXLwaist 37 to 39.4 in, hip 44.9 to 47.2 innot published
XXLwaist 42 in, hip 51.5 innot made2XLnot publishednot published
2Xwaist 42 to 44.3 in, hip 51.5 to 53.8 innot madenot publishednot publishednot 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 Decathlon 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

Decathlon to Old Navy