Manasara 58.2

58.2

caraṇāmbarasaṃyuktaṃ rākṣasākāravad bhavet
śyāmavarṇaṃ ca pītaṃ ca yakṣāṇāṃ varṇameva ca

provided with lower garments, they should have the appearance of demons; / dark-hued and yellow are the colors of the Yakṣas;