This costume is worn when Jar Jar address the Republic Senate in Padmé’s stead.

The costume makes use of the same basic dark brick-red gown as his main representative costume in the movie, but has an off-white/cream, pointed tabard with decorative patterns on it and a fancy red senate coat with white trim on the edges and a wide collar in gold, green, and red.

NB: This costume is also worn by at least two other characters in Revenge of the Sith: Sweitt Concorkill at the opera (one of Palpatine’s advisors) and an unnamed opera goer of the same race standing at the bottom of the opera stairs.