What are good swimsuits for large breasts. I am a 38G and need support while I do water aerobics so it needs?

to be a one piece or tankini. I need support so that they stay up and a thick enough material that there isn't show-through. Does anyone have this problem? Can you give me links for good ones that you like. Please help!! I currently have to wear a bra under my suit and it's getting annoying. Thanks. No crude responses plz