Lil Miquela, a 19-year-old TikTok influencer with more than 3 million followers, has promoted Calvin Klein, Prada, and other top fashion brands. She also happens to be an avatar, an online robot created by a startup with venture funding. Sarah Willersdorf, BCG’s global head of luxury, explores the somewhat wacky but very real intersection of fashion and the metaverse, explaining what the virtual world holds in store for consumers and brands.