Hi niki! I wouldn’t worry too much about measuring with a tape measure as it doesn’t give you a true measurement in todays bra sizes. I measure 27 round the back (which you add 5 to to give bra size or add 4 if you get an even no) so 32 bra size and I measure 37 around the fullest part of bust. (If u measure the same size as you’re bra size, for me 32 then you’d be an A cup, 1 inch bigger B cup, 2 inches bigger C and so on…) I therefore measure 32E however the size of bra I actually am according to bravissimo is 28GG. The 32E is nowhere near fitting! Hope that helps! xxx