Im 20 years old, but anyway I was wondering why do girls care about what size there clothes are? I mean I could understand for some but I've been going out with this girl for awhile and I would like to buy her clothes as a gift. But she won't tell me her jean size or anything, I got to look at her shirt size but then she hit me. So why does she care if I know, that's what I want to know. If you could tell me what size 4 5 6 3 2 1 0 is that would be helpful. Like is size 4 like size 27 or something like that?