Bra sizes are determined by two main components: the band size and the cup size. The band size is the measurement around the torso, just under the bust, typically represented by a number (e.g., 34, 36). The cup size indicates the volume of the breast and is represented by letters (e.g., A, B, C). Together, these measurements create a size like 34B or 36C. To find the correct bra size, one must measure both the band and bust. The difference between these measurements helps determine the cup size. Accurate sizing is essential for comfort and support, making it important for individuals to get fitted properly.