Hexagram of Solomon (Ingredient)

The Lesser Key of Solomon, Crowley/Mathers edition, 1904:

THIS is the Form of the Hexagram of Solomon, the figure whereof is to be made on parchment of a calf's skin, and worn at the skirt of thy white vestment, and covered with a cloth of fine linen white and pure, the which is to be shown unto the Spirits when they do appear, so that they be compelled to take human shape upon them and be obedient.