Mark Zuckerberg

Plain gray T-shirt, multiples of the same one The clearest statement of the decision-saving argument, made in public. At his first open Q&A in November 2014, someone asked why he wore the same T-shirt every day, and Zuckerberg answered that he wanted to make as few decisions as possible about anything except how to best serve the people who used Facebook, adding that spending energy on silly or frivolous things would feel like not doing his job. He confirmed he owned several of the same shirt. It worked as image-making too, presenting a young chief executive as too busy building to think about clothes, which is why it drew as much mockery as imitation. It is a uniform of his early years running the company rather than a lifelong rule.