The material is stretchy so it fit perfect, I probably could have gotten a smaller size. I ordered a large and wore it 4 weeks after I had my baby to a formal event. It was comfortable the no bra situation can be tricky. I had to use one of those strapless/ backless stick on bras with Nursing pads inside, that made me feel pretty weird. I will keep the dress, it would work as a maternity dress for future formals.

Im 52, 145lbs/ size D I bought a large due to carrying extra postpartum weight. I would recommend buying a medium. I would recommend large if you are currently pregnant.