First off, the number in the bra size is the measurement around the rib cage, so if the number is Higher, the girl is BIGGER. Such as myself, my number is 42. I'm a thick woman. You guys have all heard the 36-24-36 "perfect woman measurements", right? That would make her a Barbie Doll. Or more likely, built like a Puerto Rican Mami. Big ass, tiny waist, average boobs. This woman would actually be maybe a bra size 32C or D, but her waist would be so small, she'd have to have a corset to hold her upright. Those "sexy" women you see as models? The average bra size is an A cup, because they can't be over a certain weight, and boobs are mostly fat. So. That being said, I'll give you a bit of a chart to try to remember when you come across a great pair of tits and you want to brag about them to your Boys...
Measure the rib cage under the boobs, then measure the boobs w/out a bra on.. the letters correspond to the number of inches the boobs stick out from the rib cage:
A or AA: Are you kidding? sized boobs, >1 - 1.5 inches from the rib cage
B: Barely there boobs, 1.5 - 2 inches bigger
C: Coming along Nicely Boobs. 2.5 - 3 inches bigger
D: Divine Boobs, 3.5 - 4 inches bigger
DD: Double Damn Boobs, 4.5 - 5 inches bigger
DDD: Dear Lord, Diving into the Divine *motorboat* Boobs, 5.5 - 6 inches bigger
F: Fucking Awesome Boobs, 6.5 - 7 inches bigger
G: Ginormous Boobs, 7.5 - 8 inches bigger
H: Holy Hell, How do you carry those? Boobs, 8.5 - 9 inches bigger
There are a few women who have boobs bigger than these, they are either very unfortunately huge women, or porn stars begging for attention. I myself have been measured at an H level, but wear a G Cup bra. I'm not as big as you may think, but my measurements are quite a bit bigger than the aforementioned "perfect woman measurements". I'm quite ok with that. I love my curves, and I love to show them off.
I'm pretty sure it was a man who started the size chart for boobs, which is why the odd sequencing of letters, and once they thought they couldn't get any bigger, then women found out they could, women took over and that's why it starts making sense again.
Thank you for trying to keep up with this, though I'm sure as you men are visual creatures, you probably stopped reading at your favorite size because your lower head became swollen as you pictured it thrusting between the globes of your perfect rack. Women, if you're reading this and you're just now learning about it, trust me, 8=================================3 this does not equal 6 inches, either. ;)