FASHION EDITORS do it. Instagram influencers definitely do it. First lady Melania Trump has done it for countless photo ops; Kim Kardashian West has done it in Paris. Last spring, Meghan Markle notably did it on her way to a royal engagement in London. Occasionally, Jimmy Fallon does it, too, when shimmying on stage at “The Tonight Show.”
It’s the confounding and often controversial styling trick of slinging a coat (or blazer or other jacket) over your shoulders but stopping short of putting your arms through the sleeves....