Amazon CEO Andy Jassy arrives at the Sun Valley conference wearing shades. Bloomberg/Getty Images The annual Allen & Co. conference in Sun Valley is always a display of corporate casual fashion. Business and tech leaders at Sun Valley often sport designer shades as part of their look. Fashion stylist Victoria Hitchcock said this year it's all about custom, logo-free sunglasses. The biggest status symbol at Sun Valley this week may not be the private jet, but the sunglasses. Tech CEOs and media