Oversized sunglasses are worn by people who like making an entrance—or avoiding one. Think movie stars slipping through airport terminals or racing drivers emerging from the paddock in aviators before the helmet comes off. From the jet-set years of the 1960s and ’70s to hip-hop, Hollywood, and the fashion front row, big sunglasses are a contradiction. They conceal the wearer while making them harder to ignore. Big sunglasses are also useful in ways that skinny ones aren’t. They shield more of the face from the sun. A substantial frame can even give a white T-shirt and jeans more oomph. The current crop also goes beyond the familiar giant black acetate frame. There are oversized aviators, broad navigators, substantial squares, and Japanese-made frames constructed with a panache reserved for complicated objects. For men ready to give small sunglasses a rest, these nine make a case for thinking big. DiorBlackSuit XL S4F..