I treated myself to a magicsuit some months ago, horribly expensive at £120 but fabulous! It actually still fits me, although not so magic anymore as its much looser on me now. Its the first swimsuit ive ever bought that fitted my ample boobs.
Ive bought some in Matalan recently, they are priced at between £8 and £15, but the £15 ones are a much better fit and have tummy control panels, and look really good on.
I loved that 50's retro swimsuit on an above thread, a bit pricey but gorgeous. I might treat myself to it, but do i really need 5 swimsuits?? lol, i already have 4 that fit.
If you have a bit of a problem tummy then any ruching definately helps, and couple of the tummy control ones in Matalan have ruching across them, worth checking out for a bargain, and i think they go up to a size 24.