To do this, you’ll need:

  1. Once the fabric is in the hoop and the embroidery design is centered and taut, flip the hoop over and trim all around the outside of the hoop using pinking shears.
  2. Rest the edge of my pinking shears against the hoop and that cuts the fabric at the perfect length.
  3. Leave about 1/3-1/2 inch of excess fabric. Don’t cut the fabric edges to be longer than the height of the inside edge of the hoop. This will cause the excess fabric to lay against the fabric in the hoop and be visible.
  4. Apply Fabri-Tac all around the outer edge. Go around the hoop, folding the fabric over and pressing it into the inner ring of the hoop. Go around the hoop one more time, pressing as you go, holding the fabric briefly to make sure it stays adhered.
  5. Go back around and apply excess glue to any spot that looks loose.

From: https://www.instructables.com/lesson/Finishing-and-Framing-in-Hoops/