Sith shrouds were often inked with incantations written in Sith hieroglyphics. Robes known as "Wraps of Frost" acted as such shrouds, and they would steep in the corpse's dark energy and draw power from it over the centuries.
In 24 ABY, a scrap of Sith shroud was recovered by Luke Skywalker along with Emperor Palpatine's Book of Sith.
A facsimile scrap of Sith burial shroud was one of the five removable artifacts featured in the Book of Sith: Secrets from the Dark Side deluxe edition.
- Book of Sith: Secrets from the Dark Side