Chicks with large breasts don't usually have a choice. Most tops they wear will be revealing. You just don't want to show too much.
Have great boobs? Then emphasize that and hide the rest.
Got a great arse? Then show that and cover the tits.
Pick a feature (like your eyes) and run with that, concealing the rest. Don't show all the good bits, make them work to see the rest. Boobs 1st date, arse 2nd date, etc. Or wear or tight dress which shows the outline of what's there, but no skin. Let him bust his balls on his imagination. Don't be one of those slappers which show everything. Cos once you've seen it, where's the mystery?
I have small boobs, so low cut shirts go low on me, because instead of going out on a diagonal (made by boobs) the neck just goes straight done. If I think there is a chance that the band part of my bra between the cups is going to make an appearance, I won't wear it. You;d be surprised how often this happens. I think if I had more boobs, I'd be more worried, but as it is if my bra doesn't show I'm generally good with it.