The basics Add structure or bind seams with Twill Tape Trimming. The benefits Twill weave is an ancient weaving technique, and due to the structure of twill, it drapes quite nicely. The uses Bind the seams of a Chanel style blazer with twill tape trim, or add structure to a twill skirt. The bottom line Twill is characterized by its textile weave, a pattern of diagonal parallel ribs. This is different than that of a plain or satin weave.