How often do you see a track jacket with a detachable cape, eh? Before you answer, I'm going to say hopefully not often, because there's really no excuse for it unless you're the Dark Lord of the Sith, looking for something just a little bit lighter than your usual getup of cybernetic body armor.
The breastplate is also detachable if you get too self conscious about your geeky jacket. Don't think you can escape Lord Vader, though — the back of the jacket has a ghostly print of his face.
The Darth Vader Track Jacket sells for $100, which actually isn't as ridiculous as it could be, for such a ridiculous jacket.