I am between an xs/s and I am 5'00! This dress fit me well! I had room to wear a bra under it if I wanted but did not have to wear one. I originally had tried on the 0 but the built-in corset made my hips pop in the dress, therefore I opted for the size up! The pleated bottom of this dress makes it so classy while the top is tighter making the dress very flattering! The length of the dress was nice and ddid not hit the ground for me when I wore heels!