Stand in front of a large mirror wearing a non-padded bra. Wrap a soft measuring tape around your back at band level, under each arm and around the front. Measure just above your bust, right about where the straps meet the top of the cup. Enter this number in the Band Size box below.

Keeping the tape around your back at band level, measure at the fullest part of your bust. Make sure the tape isn't too tight by taking a full breath in and out, allowing the tape to slide to its most comfortable (yet snug) position. Enter this number in the Bust Size box below.