To note - if you already wear a certain bra size most often, you'll probably be the same in Negative (or at least that's the best place to start). If you don't like the fit of your current bras, it might be worth pulling out a tape measure to check.
If you've got specific questions, our awesome customer service team would love to help - no question is too small or TMI (trust us, we've heard it all) - hit us up: firstname.lastname@example.org
UNDERWIRE BRA SIZING STEPS:
1. Wear your best-fitting, unpadded, underwire bra and nothing else.
2. BAND: Wrap a soft tape measure around your back, starting at the top of your bra band (the top of your hook & eye), run the tape up under the arms and around the front of your chest over the top of your cup toward your sternum. Pull taut, but not so tight that you create an indent - make sure there's no dip in the tape. This number (in inches) is your band size. If the number is odd, round up to the nearest even.
3. CUP: Move the tape around the fullest part of your bust (typically at the center of your nips), wrap evenly around your back, holding taut without any dipping. Take this measurement in inches and subtract your BAND measurement. Each inch of difference between your band and bust measurements equals one cup size, so 1" = A, 2" = B, 3" = C etc.
4. The BAND measurement + CUP letter combined are your underwire bra size.
Not quite clear? We'll say it once and say it again, hit us up and we'll be happy to help advise: email@example.com