My FMIL has picked up my dress from the tailor this weekend! Unfortunately, I have to wait to try it on until I'm back in the U.S. in April. Arrrggg.
Anyway, I need to have all my undergarments selected to try on with the dress in April, so I'm starting to look around for those. My dress is strapless with a deep sweetheart neckline and somewhate low back (see pics). It does not have a built in bra or cups.

Should I have cups added so I don't have to worry about a strapless bra? Or does anyone know of a great strapless bra (with low back) that I should check out? I've seen the ones that "stick" on you and are completely backless... anyone try those? Do they actually work? For reference, I am a C cup and def need a little support...
I just want to figure out something that will be easy and where I won't be worried about it slipping or showing throughout the day.