I've never had major problems finding the right bra for a particular top, but I have a bigger-busted friend for whom finding the right bra is a constant battle. Over the weekend, she and I got ready together before heading out for a night on the town, and that is when I witnessed her struggle. She wore a halter top, much like this Theory Kensy Halter Top ($180). Having fairly large breasts, she stays away from strapless bras because they give her that unflattering line across her chest. She wanted to wear her regular bra but didn't want the straps to show because of the halter cut.
To see what my friend and I did to solve the bra strap problem, read more