Hun, if they had the choice, it would be nothing♥
Haha, yes, they like tight clothes, but, they also like if you leave some stuff to their imaginations. Don't dress slutty, most guys don't like that. Just, wear stuff that's a little sexy, but not too much.
BUT, most importantly, be comfortable with the way you look! Don't dress a certain way to impress a certain guy. He's not gonna like you anymore if you aren't yourself, because, if he is going to like you, he's going to like YOU, not the way you look. (and if he does, he's a shallow jerk who you shouldn't want to date anyway!)