...when encountering people who go: Oh I'm a 34A when they really are most probably not?
I am finding it hard to convince people out of believing their M & S sizes and refer them to the bra gurus fitting guide. But it's so deeply ingrained into common thinking that anything over a D is massive and that they MUST be a 34/36 frame even when they are blatantly smaller than me and I measure as a 32!