I’m pretty sure Ahmed Best wore the suit for ROTS because he did an interview where he talked about a “dark and intriguing” scene starring Jar Jar that eventually got cut and hasn’t made it onto any DVD/BD releases yet.
Years ago I heard rumors of a scene where Jar Jar was killed by Clone Troopers in the Senate building. I even saw a clip that was probably fake, but since the whole movie looked fake I couldn’t tell 😉.