I looked through my stash of fabric and came up with this:
I made it out of some old pants my friend was getting rid of and left overs from a curtain being hemmed. I basically stitched up the pants with a straight cut, used one pant leg to make the ties, and used the other pant leg and curtain fabric to make the flap. I'm hoping I won't need to figure out a way of fastening the flap.
I'm super excited because this is one of the first projects that actually worked! (Hopefully it won't be torn apart any time soon!)