No need to feel disappointed, your post has only been up for a day lol. Maybe the fastest solution would be to ask people directly who have already made their Man of Steel suits.
I'm going to be building one myself in the future, but cape patterns are generally pretty simple. You cut a large semi-circle of fabric, with the radius of it being the approximate length you want the cape to be. Cut a much smaller semi-circle in the middle of the flat length of your fabric for a neck hole, and then hem everything to prevent it fraying. Then all you need to do is figure out how you're attaching it, Superman capes tend to be held on with a couple straps that pass under your arms and tie around back before the suit is put on. That's everything I can tell you from my Superman costuming experience lol