: Subtract your band measurement from your bust measurement. Each inch of difference typically equals one cup size (e.g., 1 inch = A, 2 inches = B, 3 inches = C).
: Your breast shape (e.g., bell-shaped, asymmetrical) significantly affects fit. For instance, demi or balconette bras often work better for shallow shapes, while full-coverage styles provide better distribution for larger busts. 3. Shopping Smartly buy bra online
Since you can't try the bra on before paying, your choice of retailer is critical. 10 Tips for Buying a Perfect-Fitting Bra Online - AARP : Subtract your band measurement from your bust measurement
Sizing is not universal; a 34B in one brand may be a 34DD in another. For instance, demi or balconette bras often work
: If a band is too tight but the cup is perfect, go up a band size and down a cup size (e.g., 34C to 36B). If the band is too loose, go down a band and up a cup (e.g., 34C to 32D).
Don't rely on your current bra size, as breast size can change up to six times in a lifetime due to weight or hormonal shifts.
: Measure loosely around the fullest part of your chest.