House Rist nobles wore this green, black, and white robe and tunic during the events of the Alderaan civil war in Star Wars: The Old Republic. This costume was worn by Lord Maddor Rist, Rehanna Rist, and unnamed Rist delegates. It is also available to player characters of both factions as the “Rist Statesman” armor.
Jedipedia has excellent turn-arounds of this costume under the search terms “Rist Delegate.” PC armor screenshots are from Swtorista and TOR Fashion.
Note: Because House Rist allied with the Sith Empire during the game, face characters like Maddor and Rehanna Rist are not eligible for Rebel Legion membership, but generic Rist nobles would be.