If the embroidery design does not include the pocket shape in the file. Embroider the design on the pocket fabric with a soft, mesh stabilizer on the back. Then use the correct size of
this PDF template,
and a fabric marking pen to trace your pocket size around the embroidery design.
The large pocket size goes with the large design size, the medium pocket goes with the medium design size, and the small pocket goes with the small design size.
After you have traced the pocket around the design, make sure to add 1/2 in seam allowance around the traced shape. The PDF template does not include seam allowance as it makes it easier to position over the design.