From Iowa to Studio 54, this investigation into the rags-to-riches story of America’s first superstar designer uncovers the cautionary tale of an artist who sold his name to Wall Street.

In Frederic Tcheng’s masterful documentary, one enters the storied world that is the House of Christian Dior with a privileged, behind-the-scenes look at the creation of Raf Simons’ first Dior…