I got an email from a frustrated female reader, who seemed fed up all the incorrect information about the bra size in some stories. She didn't specify any story, though. I think this information could be useful.

The number of bra size is the is taken under the breast, it is the inches it takes for the bra to get around your body. The letter is the size of the cub of the bra,(A<B<C<D<DD<E). If you are talking about the size of a girl's chest, not the bra size, Then you go around the body at the nipple. Example ; 36D bra size corresponds a 40" chest.

Hope you will find this useful.