sentences:  It developed into a decorative surface-embroidery stitch with numerous variations by simply modifying the height, spacing, and angles of the legs and by adding additional stitches to and around the basic stitch.This stitch belongs to the large family of flat and looped stitches and is closely worked together with no background fabric visible between the stitches.Buttonhole stitch scallops, usually raised or padded by rows of straight or chain stitches, were a popular edging in the 19th century.