Love it!
I am pear shaped (B cup, small waist, curvier hip, fluctuate between 130-135 lbs) and wear a Small or Medium (4-6) in dress depending on fit or size. Typically, with a dress this style (fitted at top and waist and more flowy at the bottom), I would buy a small. Based on reviews, I bought the medium, and I am glad I did. It fits perfectly, and I love it.