Please, no khakis, unless your résumé still says you were president of your fraternity investment club. Wear jeans instead.
If you're wearing a blazer, make sure it doesn't look like a suit jacket. Try a one-button, peaked-lapel, which looks great in the office, or out on the town.
No country club golf shirts, especially when the Masters is on.
No Vineyard Vines, unless you're still quoting Will Ferrell movies.
Wear whatever socks you want, but you still have to wear socks.