Purchased this in-store today. i'm normally a small, but tried on x-small before trying on my regular size. the x-small fit perfectly. i'm 5"5, 135 lbs, with wide hips and petite derriã¨re. the dress fit well, slightly hugging my bottom. while i don't like things that draw attention to my bottom, with an outward tug or two of the stretchy material of the dress, it fit perfectly. sweater dresses tend to be bulky, so it makes sense to down size. definitely a nice addition to my closet.