I'm usually an XS in Hill House but was a bit tight on my chest, think an S would have been perfect. Really such a cute dress, very well-made and tailored, my only complaint is I wish it were shorter. The model's legs must be a mile long because on me it hit an inch or so above the knee, and I'm 5'7". I wanted a sexy/classy date night dress and the length is just awkwardly frumpy on me.