I'm a 40DDD and the 2X fit like a dream. I wear them solo around the house under racer backs, but i can put on a strapless under them for shape and wear them under those same racer backs in public without worrying about the strapless falling down because these hold it in place. They don't do much for my shape, and they have zero bounce control, but they are the perfect comfy lounge around the house type bra. I've ordered these multiple times because I love them SO much!