When Elon Musk puts on a nice suit, it has a way of looking like a demotion. Elon Musk, wearing a T-shirt and a ball cap, at the White House last month.Credit...Doug Mills/The New York Times ...

“Why don’t you wear a suit?" When Ukrainian President Volodymyr Zelenskyy arrived at the White House late last month to meet US President Donald Trump, he was asked this question by an American ...