I made this for my Bro out of one of Hub's old shirts.
I didn't take pics of how I made this. But it is pretty simple, so I'll talk it through for you.
1. Cut a rectangle out of a t-shirt make sure it is large enough to fit over your shoulder.
2. Cut the same size rectangle out of the back of the shirt or a piece of knit fabric.
3. lay them right sides together and sew around with a 1/4 inch seam allowance leaving an opening to turn it right side out. I used a zig zag stitch and stretched the knit as i sewed.
4. Trim the corners.
5. Turn it right side out and sew a 1/4 inch seam around the whole thing. I used a zig zag stitch here too.
See it's a super easy project and a free one at that!