Having seen so many threads I finally got round to measuring & could so with some advice...
Measured with a semi-solid DIY tape measure so probably not the best, but:
34" round bottom of bra (or maybe 33 if it's supposed to be pulled tight).
39" round fullest part.
For years I wore 36A/B styles. A couple of years ago a friend fitted me in a 32D but I've had a baby & put on weight since then. Can't find anything comfy at the moment (been trying 34D/DD
Thanks in advance