Step 4: Sew the side two seams. Now lay the fabric with the right side up with the long side towards you. Fold one side with the 1/4″ hem over a little more than half-way. Fold the other side over so it overlaps the first side. I folded one side of mine 6 1/2 inches and the other 9 1/2 inches and had a 3 inch overlap (6.5″ + 9.5″=16″). Make sure your fabric measures from fold to fold the same as your pillow. Pin each side seam, and sew with a 1/2″ seam allowance. Trim the seam allowance at each corner.
Step 5: Turn each side right side out and put pillow inside.