I think the photos of this tutorial speak well enough on their own. Here's how to finish the neckties of your super cape. This is my tried-and-true method for all my ties. It works with any fabric and there are no raw edges. I find this is the easiest way to get maximum look. If you are having trouble, pin at each step, so that you have both hands to do the next step.
For this portion of the project you'll only need your cape and pins.