Lay a 20-inch square piece of fabric face down, positioning it to resemble a diamond. Center a 12- or 14-inch square pillow form on napkin. Fold in 2 side points of fabric to middle, then fold up bottom point. Hand-stitch through all 3 pieces of fabric along upside-down V, about 2 inches down on each side. Stitch a button to bottom flap near point. Fold down top flap; sew a loop of cord to underside of fabric as a button holder, ensuring it fits snugly around button when closed.