Oh wow, it now makes sense! I used to wonder why I would always get hit on randomly by guys on the street when I wasn't even looking my best.
But when I'm looking "hawt", I very rarely get anybody hitting on me.
Now I know what it is! I think guys just think that we're more approachable when we're not dressed to the hilt. I mean, think about it.... would YOU feel comfortable approaching a nice-looking guy who was dressed to the nines in a 3-piece suit? EVen if that is the type of guy who you would usually like to snag, I'm thinking that most women would feel more comfortable approaching the decent-looking guy who's wearing the jeans and t-shirt.
I guess people assume that you'd be friendlier and maybe not as snobbish or something. Plus, I have to admit, usually when I'm going out running my errands just "bumming around", I am usually in an up-beat happy mood. Hence, I don't really care what I look like!
I think guys can also sense when you're genuinely happy and comfortable with yourself. That has a lot to do with it too.