Bra riding up at the back:
Firstly check that the straps are not too tight – they should be sitting firmly but comfortably on your shoulders. If your bra is still riding up at the back it might mean that the band is too loose. Start by trying a tighter hook but if that isn't enough you may need to try a smaller band size (which means you may need to go up a cup size).
Straps digging into shoulder:
A bra should be supported largely by the band – not the straps. If the straps are digging into the shoulders,it may mean the band is not supportive enough. Start by loosening the straps, but if the bra is not supportive enough you may need to try a smaller band size (which means you may need to go up a cup size).
Straps falling off shoulders:
If tightening the straps does not fix this problem, you may need to try a smaller cup size.
Spilling out of cups:
If you are falling out of the bra cups at the top or the sides you may need to move up a cup size. Any amount of swelling or spilling usually means the cup is too small. Even push up style bras should fit comfortably by creating shape without overflow.
Bra is baggy in the cup area:
If your bra is baggy, wrinkled or hollow in any area you may need to try a smaller cup size.
Underwire is uncomfortable and poking underneath the arms:
Underwires should sit comfortably underneath the arm and should encompass the entire breast. If the underwire is uncomfortable and poking underneath your arms you may need to try a larger cup size.