Alpha-sizes are sizes indicated by letters, such as M for medium or L for large. For bras, these typically span multiple bands and cups for a flexible fit. Meanwhile, alpha-numeric sizes are sizes indicated by a combination of numbers and letters, such as 36C or 40DD/E. Bras that are sized in this way are exact-fitters, meaning they only fit that size. At Bravado Designs, all of our core styles use alpha-sizing so that they fit great, even as your breast size fluctuates.