It's fun to hear about somebody else's struggles.

If you have a bra with removable straps, you can buy new straps that don't look (much) like bra straps, more like you are wearing another camisole or a swim suit underheath. That's what I've done a few times in the past. Here. The clear ones or the thin color ones are decent. The trick, then, is to find a convertible bra that doesn't cost an arm and a leg.

I do hear you on the boob-emphasizing shirts. All maternity shirts seem to fit into one of two categories: Looks-Like-A-Bag, or Look-At-My-Boobs. Have decided to go with the latter and buy some cheap camisoles so at least appropriate amounts of my upper body are covered.