Or, choose a bra design that offers more coverage. First try adjusting the straps. If that doesn't work, your breasts are probably not filling out the tops of the cups, so try going down a cup size. Also, look for designs where the straps are located in the middle of the cup, not at the edges. Or try a racer-back style.
Band rides up in back.
Try a tighter hook or loosen the straps. If neither works, go down one band size. Try loosening the straps. Otherwise, you probably need a more supportive bra, perhaps one with padded straps. See our measuring tips and suggestions and advice for men in determining the size to buy.