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I think it's interesting that melinda suggested empire waists, because those are exactly the kind of thing I must avoid with my large chest. They are made for a more average sized woman, so the seams always hit me on my actual breast, and not right underneath. I've never been able to wear them.
Bravissimo makes clothing for women with large chests. You can also buy clothing to fit your chest and have it tailored down to the correct size. For bathing suits, go to Figleaves.com and search for bathing suits by your bra size. I'm an H cup and have had lots of success doing this. These companies (like Freya and Triumph) make bathing suits especially for large breasted women. Many of them also incorporate hidden underwires or other support.