First let me say that the description for this cover up is very accurate. The material is a sheer woven---great for a cover up! Kind of confused other reviewer thought material was too thin. The description even mentions this aspect. Anyway, I also wear a 20 and ordered an 18/20 and the fit is perfect. Again, confused as to prior reviewer stating it was too small. It is so flattering and I can't wait to wear it by my pool or at the beach! I have already recommended this cover up to several friends.