I'm a fan of dark jeans and simple solid-colored shirts.
I love button up shirts.
I love seeing guys in chinos or skinny jeans, maybe a little slouched with a cute shirt, fully buttoned and a cute sweater over the top (don't always need a sweater though) and a pair of converse, plimsoles, boots, or high tops to match, a beanie or snapback and a stylish backpack or satchel bag to go with is a perfect outfit, I'd say. :)
classy. Like I prefer kind of dressed up to baggy shirts and like basektball shorts. My favorite outfit on a guy is like, dark slim jeans with some type of button down shirt (colors/stripes are good). And not sneakers...
It defiantly depends on the girl. I like to see a guys in nice slim jeans and a button down shirts... dressed up but not too dressed up. I am not a huge fan of baggy clothes. But, honestly, if I like a guy, I like to see him in just about anything... including nothing. ;)