I ordered 3 sizes of this suit and ended up keeping the Uk 54/ US 20. I am a 42DD with about a 43" waist, 49" hips and 52" around the thigh/saddle-bag area. I probably should have kept the US 18 but I wanted it a little loose to cover all of my humps, lumps and bumps. I listed it as 'Fit as Expected' but I really don't know what size I am. it depends on the brand. This suit fit fine in the chest, I guess. There is absolutely no support. I actually laughed out loud when I realized that the cups were sitting off to the side above my breasts like little mini skull caps. I took them out and may insert them into the bra (below). The bottom layer of material is mesh-like material over the stomach area. it isn't very restricting to help suck things in, but it works. At about the hip level, the material changes to black swimming suit material. The shorts are shorter than i wanted, but I just don't pull it up as far as it should be, hence why it starts at my hips instead of my waist. The seem feels a bit weird over my tush, but I think it will work. Overall, i do like the suit. I'm just hoping when it's wet it doesn't sag to my ankles since it's a bigger size. Our trip is the end of March. If I remember, I will do an update when we get back.

I ordered this 'bra' in a 2XL to wear under the suit. It actually looks pretty cute. I probably should have ordered a 1 XL for extra support, but I don't want to deal with return and exchange.
https://www.amazon.com/gp/product/B00PV2K6VU/ref=oh_aui_detailpage_o05_s00?ie=UTF8&psc=1