: Wrap a soft tape measure snugly under your bust, keeping it level with the floor. If the measurement is an odd number, round up to the nearest even inch.
: 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 : Wrap a soft tape measure snugly under