Not knowing if I'm small or medium, I bought one of each to return the wrong one. In the picture on the left I'm wearing a medium size, on the right a small one. For reference, I'm 5ft 3in, 130lbs and wear a 34C bra. I really prefer to wear a small size. There were a couple of photos with a floppy "pulled in" waist that I thought looked good on others, but they definitely look better (i.e. I look slimmer) when they're a little tighter. However, as another user mentioned, the small size wouldn't make me feel safe jumping or leaning forward, so that's a pretty subjective decision. Much luck! All in all, this is a cute jumpsuit that costs $20.
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