ou need to do this every day to get rid of armpit rolls and to make sure you are wearing the correct size. Here is a video demonstrating it:
If after you do this you have breasts spilling out of the tops of the cups, please please don´t shake them back in. You need bigger cups (and a snugger band).
More of my musings on putting on a bra here. You might also be interested in armpit and back rolls.
Photo by