The number refers to your band size, which is essentially the circumference of your ribcage. The letter actually refers to the difference in size between your band and bust measurements.

The average bra size in the U.S. has increased by DD-digits over the past three decades (in the land of plenty, it seems, our cups runneth over). National lingerie retailer Intimacy has determined, ...

Understanding how to size a sports bra relies on more than just guessing off of what you regularly wear. This process requires a more accurate measurement of band and bust, and consideration of your ...