If you're not sure what appropriate wedding attire consists of, ask your date what the invitation says. It usually specifies that sort of thing. As a brief rule of thumb, guys, don't wear jeans and ladies, don't wear pants or a white dress. Look, I love to buck convention as much as the next quirkster, but this is not the time, nor the place. For one night only, take a vow to blend in with the crowd.