Ha! When I worked at a lingerie shop I had to size folks all the time. It was fine most of the time, but there were a number of incidents when the person would get mad at me! An example being, a 17-ish girl comes in with her mom to get fitted, she says she’s a 34DD, so I measure and it turns out she’s a 34C—she got really defensive and told me I was wrong, and wanted someone else to do it. 3 different measurements later and she’s still a 34C. She flips out and the only thing I can think to say to try and rectify the situation was “All bras are different, and the sizing varies, don’t worry about it!” She proceeded to try on all 34DD bras and none of them fit her properly. Sorry, kid.