( note: I can't go braless I wear a 32DD)
Most Helpful Guy
don't wear anything. don't even wear the dress. I promise you will get a lot of attention and you will totally get laid.
Most Helpful Girl
I can't wear those sticky cup things so I either use a backless extender (make your bra shoulder straps longer to have the back sit further down)
Or do a tape bra which I can't wear for an entire day/night like a wedding but a formal event is ok. I've found using kinesiology tape is easiest on my skin and stretchy enough to move around in without feeling like I'm going to have skinless tits when i pull it off.
I've found waterproof bandaids work well in lieu of nipple pasties