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Decathlon to Aerie (OFFLINE) leggings size

The short answer

Decathlon 2XS is Aerie (OFFLINE) XS or XXS by the two brands' own charts. 2 of 7 Decathlon sizes land on a different label at Aerie (OFFLINE).

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

Every Decathlon size read across to Aerie (OFFLINE). Letter sizes on the left, Letter on the right.
DecathlonDecathlon builds it forAerie (OFFLINE), by chartSame labelAerie (OFFLINE) builds it forAerie (OFFLINE) also prints
2XSwaist 23.6 to 24.8 in, hip 31.1 to 33.5 inXS or XXSXXSwaist 24.5 to 25.5 in, hip 34 to 35 inUS numeric 0-2
XSwaist 25.2 to 26.8 in, hip 33.5 to 35.4 inXS or SXSwaist 24.5 to 25.5 in, hip 34 to 35 inUS numeric 0-2
Swaist 27.2 to 28.7 in, hip 35.4 to 37.8 inS or MSwaist 26.5 to 27.5 in, hip 36 to 37 inUS numeric 4-6
Mwaist 29.1 to 31.1 in, hip 37.8 to 40.2 inM or LMwaist 28.5 to 29.5 in, hip 38 to 39 inUS numeric 8-10
Lwaist 31.5 to 33.9 in, hip 40.2 to 42.5 inLLwaist 31 to 32.5 in, hip 40.5 to 42 inUS numeric 12-14
XLwaist 34.3 to 36.6 in, hip 42.5 to 44.9 inXLXLwaist 34 to 36 in, hip 43.5 to 45.5 inUS numeric 16-18
2XLwaist 37 to 39.4 in, hip 44.9 to 47.2 inXXLXXLwaist 38 in, hip 47.5 inUS numeric 20
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

Aerie (OFFLINE) to Decathlon