I've always been a 36C, or that's what I thought. For the past 10 years or so, I've always automatically bought the same size and seemed to get on just fine with them.
However, on a whim I decided to fill in one of those online bra calculators, as my bras just didn't look 'right'. And wow! I was way off! Apparently, I'm a 34E!
I thought it was a glitch so have tried 4 more online calculators and they've all come back with either 34E or 34DD.
Good excuse to go new bra shopping at least! 