She probably had scheduling conflicts, but Cara is big enough of a model where VS could adjust for her. For any other girl they probably simply wouldn't have casted her. I think Cara's outfits were ones that could fit on anybody, as she did not attend fittings either. Her British Invasion one was a loose fitting one-piece, and the second one was a pre-exsisting Anthony Vacarello piece. Then they just threw on Ale's old wings. I don't know if I was Cara, who really wants to be an actress as she's said herself many times, I would consider my movie role in the Amanda Knox biopic to be more important considering goals in life, not a lingerie show that everyone finds her mismatched in.