Tundan robes

Tundan robes were a style of robes commonly worn by the Sorcerers of Tund, an offshoot sect of Sith sorcerers descended from heretical Kissai outcasts and Sith-Human hybrid refugees who fled to Tund during the post–Great Hyperspace War counterinvasion. These heavy robes ranged from dark red to deep gray in color and notably concealed the wearer's entire body and face  in a series of wraps and a headdress-like cowl.

Karnak Tetsu, the leader of the Sorcerers of Tund during the Dark Wars and a Force user known as "the Maleficent," was one individual known to have worn Tundan robes in conjunction with his Sith amulet. The last Sorcerer of Tund, a Croke infiltrator by the name of Rokur Gepta, similarly sported his own set of Tundan robes prior to his destruction of the planet in 5 BBY.

Behind the scenes
Though the distinctive robes of the Sorcerers of Tund have been offhandedly mentioned in a number of sourcebooks and reference books, they were first given the explicit name "Tundan robes" in Web Enhancement 5 of the Knights of the Old Republic Campaign Guide.