Well everyone has their own taste in what they like. For a date a nice button down shirt and slacks, nice shoes. For just lounging around sports shorts or sweatpants and a tshirt such as one from macys they have a lot of cute shirts for guys there. If you're doin day to day stuff a stylish pair of jeans (american eagle has hott ones that aren't really pricey) and any shirt pretty much. You just want to be sure you are clean cut (teeth brushed just incase ;) hair washed maybe a little mousse or gel) and be confident, smile :)
i think its pretty easy, get a decent pair of jeans and iron them. wear a polo shirt plain design or a brand make nice and simple. pair of clean trainers k swiss or something. gel your hair or comb it so you look neat and tidy. wear aerosol or some aftershave. be nice and clean.
= job done its nice and easy, then just be cool with the girls try and make em laugh and that's about it really to be honest.