Thank you Doll and sprite... although I'm obviously not the OP, this was very helpful for me as well. I've posted two stories and although they've been received better than I originally thought they would, I used the standard number/cup size. Although no one's negatively criticized me about it, I think I'll use this advice for the next female character I introduce into my series.
Some readers have said I do well at descriptive language, but I personally think I could be better and need to improve. I think this advice will allow me to do just that, so thanks again.