Luxury knitwear has long been defined by its fibres. Cashmere, baby cashmere, superfine merino, each has its own story, its own heritage, and its own devoted following. Yet above all of them sits a fibre so rare, so precious, and so steeped in history that many people have never encountered it at all: vicuña . Often described as the gold of the Andes , vicuña yarn is considered the finest natural animal fibre in the world. In this article, we explore what makes it so extraord