EmbLibrary has a video on making patches. It answers your question precisely. Have a look. You can make them sew-on if you leave out the sticky stuff.
Hi there, I have done a patch just on plain cotton fabric and just left enough fabric to make a hem to sew it onto items. Or you could do it with a rolled hem around the design. hope this helps. Hugs Yvonne
You can do this using an applique technique and hoop it with washaway stabiliser and sew it on stable fabric like felt. I think it is easer to cut the fabric to the correct shape then stitch the die line on the stabiliser and place the fabric on it and then stitch the rest of the aplique stitch then the design. I hope that makes sense.
Alice.
use some 505 spray adhesive to stick the fabric in place. or whatever EMBROIDERY adhesive you have or can get.