French pleat:
This pleat are groups of triple pleats, creating a classic formal heading with a uniform finish and neat stacking to the side. French pleats, also known as knife pleats pinched in groups of three, forms a crisp heading and is exact in appearance. More suited to medium fabrics
Dutch or twin pleat:
This pleat, in groups of two is slightly more casual pleating than French. Useful for heaver fabrics than the French pleat