A correspondence-school instruction paper (International Correspondence Schools, Serial 511) on ply weaves for woolen and worsted cloth. It explains backed fabrics (filling-backed, warp-backed, reversibles, cut backed cloths, wadding fillings), double cloths (tying methods, wadding yarns, cut double cloths, double plain weaves) and triple cloths. It shows how to construct the weaves on design paper and how to make the drawing-in and chain drafts, with many numbered draft figures and practice examples.