Turn fabric right sides out. Measure the width of strip from this basting line to the top of the piping. Double this measurement to cut the strip from piping just down to basting line. Fold both sides, of these cut edges, into the center, down to the basting line. Pin two prairie point strips together with points offset.
Baste zigzag the raw edges to basting line.
Place the prairie point strip, right sided together, with the quilt top. Keep raw edges of the quilt even with raw edges of prairie points. Sew using an envelope style finish. With the needle in the quilt, pivot the quilt and sew to the corner. Miter each corner the same way.