Sometimes it's obvious which brands are gaining traction by just looking at what handbags, shoes, or jackets everyone is wearing. But sometimes it helps to have your theory backed up by metrics. And as of last year, the designer label we already suspected was flying high was, indeed, the "hottest" in the world according to one of the industry's best measurements: the Lyst Index. Saint Laurent officially topped the charts, beating Miu Miu, COS, Ralph Lauren and Prada.
