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At the Moschino show during Milan Fashion Week, models like Gigi Hadid and Kendall Jenner walked out in ensembles that looked as if someone had scribbled a fat, black marker all over them — right down to their nails. According to Miss Pop, the nail artist who came up with the zig-zag design inspired by the collection, the high-fashion version is actually pretty difficult to create. "To be honest, they're deceptively hard," Pop says. "I took a striper brush dipped in Essie Licorice, then I painted the letter U back and forth in two directions. That is incredibly easy with a pen, but so much harder with a brush." That's why, if you're doing it at home, she recommends picking up a Sharpie marker instead. "You might have to go over it a few times because the black won't be as intense, but it works," Pop says. "What I would do is use a sheer nude or a clear polish, and then squiggle the black Sharpie over my nail and seal with a topco...