Where to find good bikini tops for bigger breasts that will support them but not be popping out of the top

I'm looking for my wife because we are going on our honeymoon in a few weeks. She's lost weight recently but is having trouble finding a good top that will support her boobs without them popping out of the top. I'm sure this has been asked before but if anyone could give me a good website to maybe find something for her I would greatly appreciate it.