I am a 3x and was skeptical about the one size sizing. I am a 40 DD and let's just say a little hippy, having said that, this dress is WONDERFUL!! It's very flattering it doesn't kling to things it's not supposed to and yet it highlights your figure beautifully. I am 5'9  and the side hem hits me at the knee and the front hem hits me mid shin. It's very flowy. I am on a doctor supervised diet right now an I can see where this dress will adjust with my down sizing. In fact I will be ordering at least one more in another color.