Your boobs should be fully encased in the cup, there should be a smooth line over the bust with no lumps, wrinkling or gaping. If your boobs are spilling out of your bra, you need a bigger cup size. You may also need a smaller underband size to ensure this is firmly in place. Gap...
HELO BOYS; Shop Launches an L Cup Bra as Busts Get BiggerDaily Record (Glasgow, Scotland)