Raf Simons has done almost nothing wrong since taking up the reins at Dior. His designs have been met with critical acclaim across the board. He goes out of his way to be nice to journalists. But there's one area where Simons falls short, and that's when it comes to the diversity in model casting for his runway shows. Dior's not the only whitewashed show. Noting that close to 90% of the models cast to walk in the fall 2013 runway shows were white, BuzzFeed reached out to five top casting agents to ask: Why?