Hm, interesting topic.
I don't even own a pair of sweatpants! I'm either fully dressed or not... at all
However, fully dressed does
not mean "immaculate", not even a little bit!
I find it's a very seasonal thing for me. I have a lot of very pretty summer dresses. So in the summer time I toss on a dress and usually the dress pulls out my better half as far as fashion goes - I wear little wedge sandals, makeup, and generally look girly and take more risks.
But wintertime is another story. I revert to tomboyism. I mean, guys have it easy, sometimes I just wanna be like one of the guys! I do combat boots, jeans and black jackets almost every single day in the winter. I call it my "urban uniform". No makeup, hair pulled back or a headscarf or hat... just functional! I'm really busy in the winter with school too, that probably has something to do with it.
It's basically just not my way to be very fussy with my looks. I've got a lot of other things I like to think about. That said, I do have my theatrical days - I'm known to pull off the odd over-the-top outfit - especially if I have a little free time on my hands.