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Fabletics to Smartwool leggings size

The short answer

Fabletics M is Smartwool S by the two brands' own charts. 7 of 8 Fabletics 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 Fabletics size read across to Smartwool. Letter sizes on the left, Letter on the right.
FableticsFabletics builds it forSmartwool, by chartSame labelSmartwool builds it forSmartwool also prints
XXSwaist 24 to 25 in, hip 33 to 35 innot madenot publishednot publishednot published
XSwaist 25.5 to 26.5 in, hip 36 to 37 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 31 in, hip 39 to 41 inSMwaist 29 to 31 in, hip 36 to 38 innot published
Lwaist 32 to 34 in, hip 42 to 44 inMLwaist 32 to 34 in, hip 39 to 41 innot published
XLwaist 35 to 37 in, hip 45 to 47 inLXLwaist 35 to 37 in, hip 42 to 44 innot published
XXL/1Xwaist 38 to 41 in, hip 48 to 51 inXLnot publishedwaist 38 to 40 in, hip 45 to 48 innot published
2Xwaist 41 to 43 in, hip 51 to 53 inXXLnot publishedwaist 41 to 44 in, hip 49 to 51 innot published
3Xwaist 43 to 45 in, hip 53 to 55 inXXLnot publishedwaist 41 to 44 in, hip 49 to 51 innot published
4Xwaist 45 to 47 in, hip 55 to 57 inXXLnot publishedwaist 41 to 44 in, hip 49 to 51 innot published
5Xwaist 47 to 49 in, hip 57 to 59 innot madenot publishednot publishednot published
6Xwaist 49 to 51 in, hip 59 to 61 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 Fabletics