This dress is super cute and full of energy. It can be dressed up or down, depending on the occasion. I love love love the colors. I am 5'5", 26 waist, small chest, and ordered a size XS. I typically get a small in Resa, but because of the length and the fullness of the dress, I was able to size down. I'm sure the Small would have fit, as well. If you're unsure, stick to your true size.