In The Hollywood Reporter, Merle Ginsberg notes there’s “a long history of fashion designers creating costumes for stars above and beyond what a film’s costume designer does–and not getting the credit they crave.” The most famous example of this, Ginsberg points out, is Edith Head winning the Oscar for Sabrina when Givenchy outfitted Hepburn for the film.
In the case of Rodarte for Black Swan, a source told THR that the Mulleavy’s were “naive about movies,” meaning they didn’t negotiate credits in their initial deal, and weren’t members of the the Costume Design Guild when they worked on the film (they are now). Fox Searchlight reportedly wanted to submit Westcott and the Mulleavy sisters for Oscar consideration, but guild rules dictate that only the front credit designer is eligible.
"Are the Rodarte sisters the last great unexpected fashion greats without super famous parents or heavily edited TV competition personalities? At least for a decade, I predict.