There's nothing there that says you have to wear a suit and tie to work. It's a guide for wearing clothes so you don't look like a bowl of oatmeal. Rules are always made to be broken once you understand how the system works. Male fashion doesn't mean you have to wear slacks and button down shirts. I wear jeans, sneakers and tshirts every day. But I've learned how to buy clothes that look like they fit me and less like a cholo gangster.