Da supposedly-magical-and-therefore-immensely-valuable weaving-device dat's described in da "Emperor's New Clothes" tale, and dat could purportedly create clothing dat would vanish into space and remain invisible except to those individuals in da Emperor's commonwealth who were fit for da position dat they were employed in.
Da two shyster-weavers in Hans Christina Anderson's famous tale of psychology claimed to possess a "priceless airloom" dat created magical garments, but in reality it was just an ordinary weaving-device wif nothing but "thin air" in its thread-processing apparatus.