Well, capes in K1 are possible, but only a few people know how to actually do them. And in the case of SS and the Starched Revan Cape, it's a pre-existing cape, so he didn't have to model it in. Other then the Revan model, there isn't another model in the game with a cape. If you wanted one, you'd (or someone else) have to model it in, and animate it, which, according to SS, is a long and tedious process.
So right now, your stuck with those suggestions.