Cut two squares, each measuring 43 x 43 cm.

Cut bias binding for piped edging. First divide the fabric at an angle so that you get a long side. Measure 3 cm, mark, and cut at an angle of the fabric. Cut 4 strips for bias binding.

Sew the strips of fabric (bias binding) together to make one long one. Sew them together with a 1 cm seam allowance. Please note that the edge should be flush so that 1 cm of excess goes out over each side. Secure the seam at the start and the end.

Press the seam with an iron. Trim the seams (across) so that each seam now measures 3 mm.

Sew a casing in the left side of the bias binding. Feed the wool through the casing.

Sew the bias binding onto the right side of one of the cushion squares. Sew in the same stitching as the casing and stop 1 cm before you reach the corner. Leave the sewing machine needle in the fabric, lift the sewing machine presser foot. Cut a notch in the seam of the bias binding (i.e. the piped edging) and stop a couple of millimetres from the needle.

Turn the cushion square and sew along the next side, attaching the piped edging in the same stitching as the casing. Carry on all the way around all four sides of the cushion square.

Cut the yarn, making sure that the ends are touching. Fold the seam of the piped edging on one side inwards and around the piped edging on the opposite side, thus closing the piped edging. Secure in the same stitching as the casing.

Insert a pin in the corner of the piped edging to keep it down. Sew the cushion cover together, right side against right side. Leave a 20 cm opening for turning the cushion cover inside out and for putting the cushion inside the cushion cover.

Insert the cushion inside the cushion cover. Fold the seam inwards from the right side. Sew just below the piped edging in the same stitching.