You Should estimate that your breast will get smaller as you get closer to competition, unless you have implants. To be on the safe side if you do not have breast implants, it is best to go down one cup size or add padding if necessary. Please let me know if you would like pockets for inserts when placing your order.
Around the fullest part of your chest.
Place measuring tape right below the breasts, right where the bra strap sits, be sure it is even all the way around.
Smallest part of the torso, generally around the belly button.
Place measuring tape around the fullest part of glutes.