My current place's dress code is pretty hilarious. I talked to the woman who is in charge of writing the rules, and basically every time there's some new outrage, a new item is added to the list.
Thus, "no shiny leather," etc. I also recently went to a party where the dress code was listed as "dressy casual" which has no meaning at all. I wore a black suit and white shirt with no tie, and black and white chucks. Trying to square the circle. But people just wore whatever. Work clothes.
On the one hand, I would love to be a dress code totalitarian and require that men wear suits, hats, etc, like in Mad Men. It seems simple. But on the other, lazy hand, I hate dry cleaning.