If you order a size up it should fit exactly as you'd want it too other than that it's a great costume! The Bunny costume may not fit properly if the correct size is not chosen.

I am typically a size L-XL, with 36F cups. Even after removing the inserted cup/padding, they clearly did not use a pattern for a larger body on this suit, just sized up the small pattern. This will absolutely not look flattering on you if you have D+ cups, even if you remove the cups the bustline will likely sit at your nipples.