Without having a Merrow machine for the edges your results will be unacceptable even to you if you only use an overlock/serger for the patch edges.
We do a Safety vest for an orginazation with a 6 x 9 patch on the back. We make the patch and then treat it like an applique and run a satin stitch around the border covering the edge of the patch. Presto, a completed patch on the back.
I would recommend if you are doing this on jacket backs to do the same. You will be very happy with the results. Just remember that the patch will be permenent using this method.
We do a Safety vest for an orginazation with a 6 x 9 patch on the back. We make the patch and then treat it like an applique and run a satin stitch around the border covering the edge of the patch. Presto, a completed patch on the back.
I would recommend if you are doing this on jacket backs to do the same. You will be very happy with the results. Just remember that the patch will be permenent using this method.