The trusty topcoat was once considered a more buttoned up piece of outerwear. But these days, the longer wool coat is being pulled on over any and everything in a man's closet—and for good reason. The clean lines and universally-flattering fit makes every man look taller and slimmer. Of course, you can wear it into the office, but if you're looking to lock together a casual look, sport it like Kanye or Gosling—unbuttoned with a solid sweatshirt and some jeans. What's more, you've got plenty of options in terms of how warm you want to go—looking for something a bit lighter? Opt for an unlined version or one with a removable liner. When the temps drop, pull the coat over a denim jacket or loose cardigan for another layer of insulation.