If you're still wearing Sergio Valente, you look sort of like Huggy Bear. If you can slip two fingers between your neck and the buttoned collar of a new dress shirt, the shirt will fit comfortably after laundering. The shirt placket, the belt buckle, and the trouser fly should all line up. Speaking of belt buckles, the point of your tie should never fall below it. Rent no clothing.
Women notice shoes.
Good shoes and a good haircut matter more than a great suit. Neckties decorated with cartoon characters, golf tees, or the paintings of dead rock musicians coordinate with nothing. It is never acceptable to loosen your tie, except during the process of its removal. The seat-belt shoulder strap goes under your necktie. You can't wear a bow tie with anything other than a tuxedo if you're under forty-five or not a famous novelist or not a total geek, professor.