The twill weave is characterized by marked diagonal lines produced by the interlacing of two warp threads with one filling thread in alternate rows. This wale, or cord, effect may be observed in such twills as herringbone, serge, worsted cheviot, jersey, foulard, surah, covert cloth, gabardine, ticking, jean, and drill. The twill weave provides the cloth with superior strength, desirable for work clothes and suits.