Waite, Arthur Edward (1857-1942)
... the Unclean Spirit will appear to you in a scarlet surcoat, a yellow vest and breeches of pale green. His ears will be those of an ass.[*] He will ask for your orders, and, as he cannot do otherwise than obey, you may become the happiest of men.
[A. E. Waite, The Book of Ceremonial Magic, pp. 132-33.]