Whether it's trending, outdated or never-before-seen (like this top made from Instax photographs), festivalgoers are slightly more blase toward the rules. Street style at the fall shows delivered a sort of ode to the classic denim-on-denim look made famous-or infamous-by Britney Spears and Justin Timberlake at the 2001 American Music Awards, and more recently, by Ye and Julia in Paris. As much...