The Devil wears Prada, because black is so slimming. And you can spill pitch all over it and no one can tell:

Thus were the hopes dashed for employees who were ugly, aged, had a mouthful cockney-choppers, but were still cute. Nope. It's an interesting question - does Prada have the right to fill the retail stores with chipper size-zero sylphs? Sure. But making everyone in the back office conform to the Prada ideal is a bit severe, like making everyone in a newspaper office speak in pyramid leads and anecdotal opening paragraphs.