“Diane von Furstenberg: Woman in Charge” makes the case for artistic simplicity, for better or worse. The story of an iconic 20th-century fashionista, it takes the form of a traditional talking-head documentary while exploring its eponymous subject: the Belgian designer and princess best known for bringing the wrap dress to prominence in the early 1970s. However, the distinction between von Furstenberg’s sleek, form-fitting design and the movie’s run-of-the-mill aesthetic is that while both approaches are in wider conversation with their respective art forms, von Fustenberg’s (re)invention went against society’s grain in its reclamation of femininity, while the visual approach from...