Run ribbon through back casing. Remove pleating threads. Attach ribbon to both sides of bonnet, centering over smocking rows. Ribbon or lace rosettes may be added. Sew lace to fabric with a small zigzag stitch with one stitch going into lace heading and one going off the edge of the lace.
Press lace out and fabric to wrong side.
Topstitch with a zigzag stitch, one stitch going into lace heading and one just off lace heading. Trim excess fabric away from seam on the wrong side. Rosettes may also be an extension of the ribbon tie, made in one piece. Use a 22 inch length of ribbon. Measure 10 inches for tying.