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Under Armour to Aerie (OFFLINE) leggings size

The short answer

Under Armour XXS is Aerie (OFFLINE) XS by the two brands' own charts. 6 of 8 Under Armour 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 Under Armour size read across to Aerie (OFFLINE). Letter sizes on the left, Letter on the right.
Under ArmourUnder Armour builds it forAerie (OFFLINE), by chartSame labelAerie (OFFLINE) builds it forAerie (OFFLINE) also prints
XXSwaist 24.5 to 25.5 in, hip 33 to 34.5 inXSXXSwaist 24.5 to 25.5 in, hip 34 to 35 inUS numeric 0-2
XSwaist 25.5 to 27 in, hip 34.5 to 36 inSXSwaist 26.5 to 27.5 in, hip 36 to 37 inUS numeric 4-6
SMwaist 27 to 29 in, hip 36 to 38 inS or Mnot publishedwaist 26.5 to 27.5 in, hip 36 to 37 inUS numeric 4-6
MDwaist 29 to 31 in, hip 38 to 40 inM or Lnot publishedwaist 28.5 to 29.5 in, hip 38 to 39 inUS numeric 8-10
LGwaist 31 to 34 in, hip 40 to 43 inLnot publishedwaist 31 to 32.5 in, hip 40.5 to 42 inUS numeric 12-14
XLwaist 34 to 37 in, hip 43 to 46 inXLXLwaist 34 to 36 in, hip 43.5 to 45.5 inUS numeric 16-18
XXLwaist 37 to 40 in, hip 46 to 49 inXXLXXLwaist 38 in, hip 47.5 inUS numeric 20
3XLwaist 40 to 43 in, hip 49 to 52 innot madenot publishednot publishednot published
1Xwaist 39 to 43.5 in, hip 47 to 50.5 inXXLnot publishedwaist 38 in, hip 47.5 inUS numeric 20
2Xwaist 43.5 to 48.5 in, hip 50.5 to 54.5 innot madenot publishednot publishednot published
3Xwaist 48.5 to 53 in, hip 54.5 to 58 innot madenot publishednot publishednot published
Tinted rows change label or sit between two sizes. 3 sizes have no counterpart on the Aerie (OFFLINE) 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

Aerie (OFFLINE) to Under Armour