Rodarte didn't just have "input." Kate and Laura designed entirely on their own the costumes for the principle dancers in the Swan Lake ballet scenes, in addition to Nina's white gala gown, several practice tutus and the knit scarves, leotards and leg/arm warmers.
Amy Westcott did everything else, minus the ballet corps costumes which were apparently designed by Zack Brown.
That's the facts.
Also, correct me if I'm wrong, but I haven't read anything coming from Rodarte that would make me believe they were looking to stir up controversy. All I've seen are articles that plainly say that Kate and Laura are ineligible to be nominated because they are not members of the Costume Design Guild and that their contract didn't give them credit as the hired "Costume Designer" of the whole film.
It seems as though bloggers are making the Mulleavys' out to be throwing a fit, when in fact, I haven't read a single statement from the sisters themselves in regards to the issue at all.
And to me, Amy comes out of this whole situation looking bitter that she wasn't asked to design the key costumes for the film. This is no discredit to her work on the film, it just seems very sour of her to come out and complain now...or complain at all. None of us are hearing about a back-up dancer scream and yell about not getting a lead, or getting more camera time. Why does she have to make this all a mess? The film has been widely received extremely positively...why not just be happy for the work you put in and the success that the film is experiencing? Everyone else involved seems to be doing just that.