I'm always a bit hesitant about sizing on amazon items but since there were only 2 sizes offered, s/m or l/xl, gambled on s/m. Regular dress size 4-6. It's hard to tell from photos but top waist portion is stretchy. There is a zipper as well but I didn't need to use it and was able just to pull on and off. It is comfortable so I wore it for several hours long party where I did have to remove corset due to lack of comfort. Be aware that it is pretty short in the front but I wore it over some cropped ruffled leggings so this wasn't an issue for me.
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