Okay, I know a couple of places you can find these. There are templates made by Armothe on his forum. I know that they used to be in the armory, but I don't know where they have been placed after the forum update. You might also want to search on flickr or Brickshelf for templates. There is also the Eurobricks templates index
to gaze through. For cape material, you could use printable fabric, it comes in rolls and sheets by the iron-on stuff at your local craft store. I have never seen it in a color other than white, though. I would say if you want to use something cheaper, go with an extra-starched polyester or some of the nicer felt no the roll. I hope this helps!