Virgin,
Red silk:
Pleasure slave (not a virgin)
Black silk:
Passion slaves, bred for specificate attributes, thought to be extremely well trained in the passion arts, Extraordinarily trained slaves, very adept in Gorean dances. May also denote an unowned slave.
Brown silk:
Normally of rough, woven cloth, most common of slave garment. Inexpensive and easy to clean. No specific meaning.
Gray silk:
Owned by the City or Municiple owned slave
Purple silk:
reserved for or trained by the Priest King
Striped slave livery:
slaves of the chain of Slavers