Place the patch template (without cutting) on the leather and trace the cutting line with the tracing wheel. When you remove the template you will see that the right side of the leather has light impression dots. Cut the leather along these dots.
Place the cut-out template for the patch over the leather patch, align the edges and secure the layers with a Scotch tape.
|Stitch the patch following your awl marks. Use running stitch or backstitch, whatever you prefer, and try to sew without moving the sleeve or the patch too much.|
Once you are done secure the thread under the patch and, voila, the sleeve is done.
This is just one way of doing it. I hope you will be able to use this tutorial to repair your favorite sweaters.