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Sizes generally have more room for more bodies but tend to run on the the traditional bigger side.
XS fits like a small (women's size 4-6)
Small fits like a medium (women's 6-8)
M/L fits like a large (women's 10-12)
Curvy fits women's size 16-18
Curvy + fits women's size 18+
SEE PHOTOS FOR SIZE REFERENCE
Solo model: in size XS.Model duo: on left wearing size M/L, on right is in size Curvy.Model with baby: in size M/L