Nope, Troi never wore red. She wore a blue "space cheerleader" outfit for the first few episodes of Next Generation (which was an t-shirt style top, short skirt, and boots.) After a few episodes, she changed into the onepiece jumpsuit. Since she is the ship's counselor and technically outside of the command chain, she didn't have to wear a standard uniform. During the 2-part episode, "Chain of Command", Captain Jellico (Ronny Cox) had her wear the standard uniform, but she was still in blue. After that episode, she changed back into the jumpsuit. In the 7th season, she finally wore the regular uniform... and looked a lot better. :) In Star Trek: Generations, she wore the Next Generation-style uniform, not the new Deep Space Nine/ Voyager version. In First Contact, Insurrection, the "Star Trek: Voyager" episodes, and Nemesis, she wore the standard black-with-gray shoulders uniform. And in Nemesis, she was transferred to another ship, but I don't know if it was stated that she would be the first officer. In that case, though, she would probably change into a red uniform... or in this case, a uniform with red trim. (This doesn't count her civilian, casual, or "blend in with local alien population" clothing.) During the 2-part episode, "Redemption", Data wore red when he was given temporary command of another ship. When Picard was believed to be dead during the 2-part episode, "Gambit", Data was promoted to first officer. But, he continued to wear the gold uniform... even though all first officers normally wear red. For the first season of Next Generation, Worf wore a red uniform, but changed to gold after becoming head of security after Tasha Yar was killed in "Skin of Evil". He is the only Starfleet officer (that we know of) to wear a sash over his uniform. Any other questions? :-)