can some one tell me a way to put patches on a coat, that won't mess it up to much, if I ever want to take them off? like I have an old army coat, that I want to put a few peace sign patches on, but I don't want to mess up the coat if I ever want to take them off, so is there a way I can put the patches on that I can always take them off if I want to? oh the patches are the ones you can iron on if that helps