IamA bra fitter at a chain of bra stores. AMA!
My short bio: I started in my store as a sales associate, and have completed a bra fitting training program. I have worked through crazy seasons (Christmas!) and also insanely slow periods, where the store might be empty for hours. I've fitted all sorts of boobs, and am a wee bit of a bra nerd! AMA!
EDIT: everyone should know about /r/abrathatfits They are very helpful, knowledgeable, and full of bra suggestions :)