May be done by machine or hand. The term tulle denotes a particular size, with illusion the term for a smaller hole version and net for the larger hole version. The coloration of the fibers varies and produces a unique speckled appearance to the fabric. Harris Tweeds, made in Scotland are the most valued. The result is a series of diagonal lines.
Twill weaves are very durable and firm.
Denim, as used in jeans, is an excellent example of a twill weave. A recent fashion trend has been the use of burn-out velvet or Devore Velvet which has a chiffon back and the velvet pile woven into it in a pattern. The velvet in both cases is made the same, only the backing is different. Most common fibers used are nylon and silk and rayon. The cut pile is significantly shorter than the pile for velvet.