I made this a couple years ago, but since I just joined in March and it's only now gotten warm enough to pull this out to wear, I thought I would share it.
I designed it based on the back of a cape worn on a statue of the Morrigan. Designed on graph paper, then traced the outline to iron-on transfer paper, ironed it on the jacket then painted it up with fabric paint. It's been through a couple washes, so some of the edges are not as straight as they used to be, but still looks good (at least I think so, lol)
Here's a close-up