Well, it turns out there is a reason after all for Blanchett's (aka CB) hairstyle. In a recent interview with Cinematical, director George Lucas (aka GL) revealed his regard for Louise Brooks.
Was that hairdo an homage to somebody specifically in the fifties?I wish I had known. I once went to the Skywalker Ranch north of San Francisco. And I was impressed by the silent film movie memorabilia on display. None of it was Brooks related, but there was stuff belonging to Rudolph Valentino, the Keystone cops, etc..... George Lucas wasn't there at the time. But had I known of his interest in Brooks, I would have left him a LBS button. George, write to me . . . . I have an idea for a film.
CB: Well, Vidal Sassoon. ...
GL: I'm a big fan of Louise Brooks, a big fan of the bob, and I couldn't resist. I just had to get that in a movie.
CB: I didn't resist.
GL: Just something that had to happen.