Diab Duin was a Sullustan male who served as a politician in the Galactic Republic during the Cold War and joined the Rift Alliance. Following the discovery of Stygium crystals on Aeten II, the Supreme Chancellor of the Republic appointed Duin to represent the world, knowing that the Sullustan was a dour man of few words who would be able to keep Aeten’s secrets within the Republic.

Jedipedia has excellent 3D turn-arounds of this costume.