Silk is a valuable commodity in the Hyborian kingdoms and it flows from Khitai in the east and Stygia in the south. Khitan silk is drawn from silkworms whereas Stygian silk is harvested from the giant spiders that inhabit the dark reaches of the southern lands.
Khitan silk is prized for the clinging, sensual fabric that it creates. It is very tolerant of dyes and holds brilliant color. Any nobleman of note has at least one outfit of Khitan silk.
Stygian silk is stronger and more durable, offering greater protection at the cost of a coarser weave. Dyes tend to fade quickly but the tenacity of the fabric makes it a favorite among the merchant class.