Why BRA sizes are measurd as A,B,C,D,E,F Not 1,2,3,4,5 ?---Funny Bra Size

Why BRA sizes are measurd as A,B,C,D,E,F Not 1,2,3,4,5 ?
Because...
A = As flat as Airport runway.( Almost Boobs)
B = Barely seen.(Barely There)
C = Comfortable.(Can't Complain)
D = Damn Gud.(Dang)

DD- Double DAMN!!.
E = Enormous.
F = Fake.

G = Get Reduction

H = Help me, I have fallen and I can't get up