Stitch across hem twice to secure. Repeat from other corner. Open fastening tape. Turn to right side and press. Press fastening tape.
Stitch strips together using a french seam.
Pin and stitch. Divide frill into three sections, 1.5 times length of side, 1.5 times length of bottom and 1.5 times length of side. Working down one side, across the bottom, up the other side and one section at a time,pull up gathering threads on frill to fit cover. Separate the two halves of press fastening tape. Fold in half and pin one side of fastening tape centrally through all thicknesses.