DDs aren't even that big, maybe the size of a large orange, depending on the band size. The scale goes all the way up to K and is relative to band size as well, for added fun. Most people wouldn't know this though, because retailers seem to insist on carrying a limited stock with no greater than DD30-equivalent cups and a variety of band sizes, and a lot of women seem to think that a large cup size is somehow shameful (gee I wonder why that would be) so they insist on a C or D and then end up with poorly fitted bras that crush their chest but also provide no support.