The center piece between the cups should sit flat against your breastbone. If it’s hovering, the cups are likely too small.
It should be level all the way around. If it arches up your back, the band is too big. You should be able to fit two fingers underneath it. how to buy correct bra size
Wrap the tape loosely around the fullest part of your chest. Don’t pull it tight—just ensure it’s level all the way around. The center piece between the cups should sit
Your breasts should fill the cups without "quad-boobing" (spilling over the top) or gaping (extra space at the top). If it arches up your back, the band is too big
When you put on a bra, lean forward and use your hands to pull all your breast tissue from the sides into the cups. This ensures you’re actually sitting in the bra correctly before you judge the fit.
Wrap a measuring tape snugly around your ribcage, directly under your bust. Keep the tape level and parallel to the floor.
Subtract your calculated band size from this bust measurement . Each inch of difference represents a cup size: 1 inch = A 2 inches = B 3 inches = C 4 inches = D (and so on) 3. The "Fit Check" (The Most Important Part)