Lace for insertion has its two edges finished symmetrically. A design with fine tucks and insertion of lace can be combined and applied in a horizontal direction. The bias tubing inserted in such lace can be tied into a bow. The tubing may also be pulled to produce gathers.

Regularity Smooth fabrics should be sewn only with very regular yarns. In spun yarns, this is achieved by repeated doubling and drafting, and by combing out the short fibers. Strength Yarn strength depends on the quality of the fibres, the yarn regularity and the twist. Folding increases the strength.