I made this super hero, (aka big brother cape) for a very special little boy I know. I used the template (sorta) to make it. I used her shape but ended up winging my dementions and thought it turned out cute as could be.Here is her Tutorial.
I did not use any interfacing because I wanted it to flow as free as possibly. The collar can be worn eaither folded or up depending on how the kids like it or feel more comfortable. I personally like folded so you can see the fabric contrast.