Do's: There's nothing hotter than a guy in a fresh white tee. I don't care if it's Hanes or Balmain, just as long as it's crisp and clean. Don't forget to carry around a Tide pen if you're a catsup aficionado.
Don'ts: Don't you dare wear a droopy beanie in the summer (or ever). No girl likes anything that looks soggy or soft. Or sweaty. Unless you're doing something hot. Like playing basketball.