Unofficial Star Wars character designs inspired by Thrawn: Treason by Timothy Zahn.
My interpretation of what the characters, Eli, Ronan, and Vah'nya might look like. These designs place the characters shortly after the events of Treason which is why Ronan, the Imperial Assistant Director, has variations wearing a Chiss uniform. There is no confirmation or canon that he would switch uniforms, but now, according to the story, he has become a liaison like Eli I'd think he would have to. If he does, I think he would keep his cape as a visual reminder of his loyalty to the Empire.