I have never had someone else measure me. But, I remember seeing instructions on how to do it in an old mail-order catalogue decades ago and did it, myself. Bras are always sold in even-numbered band sizes (32, 34, 36, etc.) but I always got an odd-number when I measured. So, I just did my best with it. 😂

Miraculously, I managed to buy a bra once that fit me perfectly! Even after wearing it all day at the office and then going out for dinner with some coworkers afterwards (Girls' Night!), arriving home late, it didn't bother me at all. So, I raced back to the store a couple days later and bought several more of the same brand & size so I'd have plenty of them! 😁 That was probably twenty years ago and I still have some of them because I took very good care of them and wear some of my other bras, too, not just those.