For you back size you add 4 if the number of inches in even and 5 if the number of inches is odd so that might make you a 40 something if you havent already done this to 35 inches
For the cup size you measure around the fullest part of your breast, with the tape measure at the same height around the back as the front. If that amount is the same as your back size you have an A cup, every additional inch you add a cup size, so 42 would give you a C cup.
The cup size is a little more complicated, because it seems to be done on a chart, and is the difference between your ORIGINAL ( not with the added on 4 or 5) underbust measurement,
i just measured full size of my bust and its 40.5 ? under my bust is 35..
does this make me 34 b ?
lol
typical man! lol
sounds very complicated, but after years of study i think i can help just by looking at them
I would say it makes you a 40B
35+5 = 40 for back size, and you have a little extra around the bust so 40=A 41=B so I would say B