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Fabletics to lululemon leggings size

The short answer

Fabletics XXS is lululemon 4 by the two brands' own charts.

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

On 1 sizes the charts land two or more sizes from the same label. Brands do not measure the body the same way, so on those rows treat the chart answer and the same label as the two ends of a range.

Every Fabletics size read across to lululemon. Letter sizes on the left, US numeric on the right.
FableticsFabletics builds it forlululemon, by chartSame labellululemon builds it forlululemon also prints
XXSwaist 24 to 25 in, hip 33 to 35 in40waist 25 in, hip 35 inLetter XS
XSwaist 25.5 to 26.5 in, hip 36 to 37 in4 or 6not publishedwaist 25 in, hip 35 inLetter XS
Swaist 27 to 28 in, hip 37.5 to 38.5 in6not publishedwaist 27 in, hip 37 inLetter S
Mwaist 29 to 31 in, hip 39 to 41 in8 or 10not publishedwaist 29 in, hip 39 inLetter M
Lwaist 32 to 34 in, hip 42 to 44 in12not publishedwaist 33 in, hip 43 inLetter XL
XLwaist 35 to 37 in, hip 45 to 47 in14not publishedwaist 35 in, hip 45 inLetter XXL
XXL/1Xwaist 38 to 41 in, hip 48 to 51 in16 or 18not publishedwaist 38 in, hip 47 innot published
2Xwaist 41 to 43 in, hip 51 to 53 in18 or 20not publishedwaist 41 in, hip 49 innot published
3Xwaist 43 to 45 in, hip 53 to 55 in20not publishedwaist 43 in, hip 51 innot published
4Xwaist 45 to 47 in, hip 55 to 57 innot madenot publishednot publishednot 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. 3 sizes have no counterpart on the lululemon 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

lululemon to Fabletics