This top could dress up or down as the fabric is really pretty. The seaming details are top notch. My mother is very petite and probably would fit a small, but she got it in the medium, and it looked stunning and very dressy on her with a nice flowing fit. Medium is my size, and it looked great and fit great on me as well. In my opinion, wearing one size larger looks very dressy, whereas wearing your true size looks a bit more athletic but still very attractive. Both are great looks.