Victoria Secret!! Their miracle bra swim collection is AMAZING!!!! I own about 5 of their bikini tops and everyone always thinks my boobs are fake!

I am new here, but wanted to comment about your question. The best, most supportive bathing suit I have ever had was purchased at .......drumroll please..... Wal Mart!!

What was important about it is the fact that it is a one-piece design with a halter top. The tying of the top at the back of the neck lifts and supports my chest (fiance said, "Your boobs look awesome!":o). Anywho, I am a 42D, so this is saying a lot!! It also has a "dress" skirt over the lower half to hide my belly and upper thighs.

The key is....think halter top.

Hope this helps.