I ordered the XS and S and decided to go with the XS. The major difference in fit between the two sizes was with the bust area. i would say if you're anything above a 34B the XS would cause some awkward sports-bra uni-boob effect. It was a tiny bit shorter and sort of held you in more (felt kind of like spanks) but in a comfortable way. Definitely a revealing/ body conscious dress but also quite flattering. I'm usually between a 2/4 in dress, wear a 26/27 jean and a XS/S shirt

Duplicity Contrast Dress

Hervé Léger

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Size Worn: XS

Usual Size: 4

Height: 5' 8"

Weight: 127lbs

Bust: 32B