All things being equal, which would get more attention: A girl in a Cannibal Corpse hoodie and baggy jeans or the done-up chick with basically nothing on?
...yes, there's a band called Cannibal Corpse. I didn't make that up, unfortunately.
Anyway, my point is, when you go around dolled-up, it acts as a potentiate* for attention you would not normally receive. Indeed, you can still avoid people no matter what you wear, but whenever you *are* around them, well... y'know.
There's a difference between making an effort and looking plastic, stupid, dolled-up, half-naked, attention-seeking, etc. I'm a bit confused as to where these assumptions are coming from (maybe because you're men?). I'm talking about classy, well-groomed, color coordinated, etc... More like office-wear than club-wear. Though a few years ago, I'd definitely prefer wearing a Cannibal Corpse shirt (yes, I know the band).
I'm not trying to convince anyone else to care about their looks, and I couldn't care less about how others choose to dress. It's just my personal preference. Dressing weird/sloppy started feeling like a bigger disadvantage and like literally wearing my emotions/weaknesses for others to see, so it didn't make sense for me, personally, to keep doing that. That's all.
I think facial expressions are kinda dubious, though. I don't doubt the validity of your own experience or anything, but mine, as a dude, has shown me that a lot of guys have a very limited conscience when they talk to or approach women. They obviously aren't to the extent of being crazy, haha, but annoying, yeah, *that* I could see....
Well, I haven't done statistics on it, so I guess I can't be sure. It's just my impression, but maybe it's just something I'm imagining.