When women want attention, they dress attractively. When they don't want attention, they dress casually. It's just like birds. Ever wonder why they call it the birds and the bees? If you're a guy and you hit on women in sweatpants, you'll most likely fail, b/c those women are not signalling their availability and interest.
And before someone goes all "women should be able to dress however they want and not get raped," consider that I'm not advocating rape. I'm pointing out that the previous poster asked "attractive" women for their phone numbers, not every woman. Logically, this implies that he was asking women who were seeking attraction by dressing attractively and presenting themselves as available and seeking mates, just like birds who sing to signal their availability.
The reason everyone confuses attractiveness is that our media present it as a thing that you have or don't. "Movie stars have it, computer nerds don't." But the real truth is that attractiveness is something you do. When you want to "get out there," to signal your availability and interest in mating, you do attractiveness. It doesn't matter how fat or pimply you are: You adorn yourself, you clean yourself, wear fancy clothes, you grab attention, you impress people, try hairstyles. Once you're married, reproducing, dropping kids off in a minivan on Saturday morning, you wear sweatpants and other casual clothes and no one (except social retards, of which there are unfortunately plenty) hits on you. Or else if you miss that egoistic feeling of being attractive, you dress up a little bit and reject all the people that hit on you.
This is how it works. It's just one step advanced from non-speaking mammals. Political correctness is just an attempt to cover up the realities that not everyone understands, just like religion and the Republican party are shorthand behaviors/scripts for people to follow when they don't know exactly what to do.