If your just lounging around the house then sweat pants, a t shirt are fine, but if your going to go on a date with someone yeah dress up I mean think about it if your going to go on a date with a guy and he shows up like he like he just mowed the yard, what would your reaction be if your all dressed and it looks like he's wearing and pants he wore 2 days ago. He's not Johnny Depp so that whole looks like he just rolled out of bed, forgot to shave, hasn't taken a shower in a week, reeks of booze and smoke, yeah that rarely works on non celebrities.
Guys like it when girls dress up and look pretty just like girls like it when a guy actually decides to put on a polo shirt and nice shoes, instead of basketball shorts and flip flops.
Well I always just wear jeans and tshirt or whatever, especially during the week at school and all. I mean, it's school and I don't want to be there to begin with. But I do dress up for dates. And my boyfriend never dresses up. I've seen him dressed up once! But I really don't care for real. But he does always smell nice :)