I bought this costume originally in a 14, im anywhere between a 14-16 atm. however after reading some of the reviews and then trying it on I went back on to order the 12. I'm pleased I did as the 14 was not as supportive as I would have liked around the bust and the tummy control did not feel as good as I imagined considering the price! However the 12 was a much better fit, and holds up a lot better when straps were removed, although I would have expected maybe some kind of grip around the edges for extra prevention of the costume slipping. It's a gorgeous costume, not see through, the colour is just what I was looking for and the shape is lovely!