This dress does run a tad small. for me it was small across the chest and i did have to shimmy into it. i am 5'6", 110 and got size s. if i had gotten the m it would have looked a tad frumpy (on me). pretty, but wasn't happy with the fit aside from that the "line"separating the top from the bottom was rather high for me and it seems that it was not really intended to be an "umpire" waist. i tried a belt with it and at my natural waist left the line uncovered several inches up toward my chest. i