 In addition to the normal lockstitch, construction stitches include edgestitching, understitching, staystitching and topstitching.Seam types include the plain seam, zigzag seam, flat fell seam, French seam and many others.With the development of cloth simulation software such as CLO3D, Marvelous Designer and Optitex, seamsters can now draft patterns on the computer and visualize clothing designs by using the pattern creation tools and virtual sewing machines within these cloth simulation programs.