I am usually a small, maybe an XS, but I ended up with an XXS small in the dress. I am 5'5" and 130lb. I am not a fan of the drapey style of this dress, but if you cinch the waist with a belt, it looks amazing. I wore this to a hot outdoor wedding and the fabric is very light and comfortable. I received compliments on the color and style of the dress all night long. I feel great in the dress and I very happy I purchased it.