Western measurements at home use inches to figure out bra sizes. Japan, where the Pokemon games were created, uses centimeters, which means there's a slight variation in how quickly cup sizes increase. So while AA and A are universal, Bs sometimes become Cs, and Cs can be C, D, or E, and after that it gets even wilder but you don't have the boobs to worry about that!

Either way, it doesn't matter, if I make the bras myself then they will be fitted perfectly without much in the way of rounding or guesswork!

*Imogen breathe between statements!*