Do what style you like, but make sure it FITS!!! Easily the most important part of looking good in clothing, make sure the shoulder seam breaks right at your shoulder, and that the shirt hugs you, but at the same time you aren't ripping out of it, works really well if you've got a decent chest and abs. Coordinate a little, but don't try to hard, girls will silently laugh at you. When I started trying to dress nicer I looked in gq and at askmen.com, but a lot of that is just check out this 80 dollar t shirt, nothing about actually styling or dressing well. Just go with what works for you, and make sure it looks good on you. Don't buy cloths that you like that aren't in your size even if you really like em, I used to do that and now I have a whole bunch of unused cloths lying around.