Twill's a type of fabric woven with a pattern of diagonal parallel ribs. It's made by passing the weft thread over one or more warp threads and then under two or more warp threads and so on, with a "step" or offset between rows to create the characteristic diagonal pattern. Because of this structure, twills generally drape well. Examples of twill fabric are chino, drill, denim, gabardine, tweed and serge. Harris Tweed's a luxury twill handwoven on the Isle of Harris, Outer Hebrides, Scotland. S… (More on Twill)