I've had this cape in my head for a long time--since I made the skirt out of the same fabric, actually--so it's just as well my daughter decided she needed a sparkly cape for her Halloween princess outfit. She was more than happy for me to use the fabric we already have, too. I wish I had better photos; it's grey and dim today, and I had to use the flash indoors. But you get the idea, and I'll be sure to post photos of the entire princess outfit after Halloween, although they are forecasting rain for Halloween, how dare they?!
I used two layers of a basic cape shape. The underneath layer is the blue satiny stuff, and the top layer is the sheerer, sparkly stuff. I hemmed the sides and bottoms of each piece separately, then zigzagged them together at the raw neck edge before sewing on the narrow binding that extends into the ties, which you can see below.
That way, the layers flutter individually as she runs.
It turned out just as I pictured it, and I am beyond delighted with it. My daughter seems pretty happy, too. And as far as Halloween sewing goes, this was extremely low stress.
Are you doing any costume creating this year? How's it coming along?