Wearing all-black-everything was huge this year, thanks to the street goth movement. But well-dressed guys like A$AP Rocky, Kanye West, and Tyson Chandler pushed the trend to a higher place by incorporating leather into their dark looks. Black is an understated color, but leather is a luxe and expensive material, which is why the combo is so chic. It stunts without screaming new money. It's simple, bad-ass, and classic at the same time. Plus, it helps that brands like En Noir, Alexander Wang, and Givenchy are consistently making great black leather pieces.