Measure your band. Wear a lightly lined (non-push-up) bra so your breasts are as close to natural as possible. Wrap a measuring tape directly under your breasts. Make sure it’s directly parallel with the bottom of the bra band.
Now measure your bust. Place the tape at the fullest part of your bust. Make sure it’s parallel to your band again.
Subtract the band size from your bust size to find the right cup size. Every inch equals one cup size up.
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