Part one of an article on the construction of transparent chiffon velvet woven as double cloth, in which a knife cuts the pile threads between the top and bottom cloths. It gives the full warping disposition (Japan crepe ground, viscose rayon pile, spun silk edges and binders), reed and filling specifications, and shaft-by-shaft entering instructions for edges, body and pile. Fig. I shows the cutting principle, Fig. II the harness draft and Fig. III the weave pattern for cam set-up. The article ends with "To be continued".