Even in a relaxed office environment, where a dress code isn't mercilessly enforced, we've always believed that stepping up your style at work is the easiest way to look like you're on top of your game. And whether cut from cotton, wool or textured fabrics like tweed, today's better versions are actually cut a lot like your favorite pair of denim. Here are a few tried-and-true favorites that can easily be subbed in for jeans but won't feel stuffy at the office.