Guybrush Threepkiller Costume
Once on CATO NEIMOIDIA (The Eastern Arch) you will reach "The Infinite Nebstar Casino", at the end of this area you will reach a room full of fog and frozen "Neimoidians". Here you will fight Imperial forces that include two Carbonite War Droids. One of these droids will seal the room's exit with Carbonite. Once you defeat them clear the exit and continue down the hallway until you find a Jabba the Hut hologram with three slot machines in front it and some Guybrush Threepwood statues around, one of them pointing to the slot machines. Destroy these machines and watch as a new Holocron appears where the machines were. This holocron will unlock the "Guybrush Threepkiller" costume which is based on Guybrush Ulysses Threepwood, the main character of the Monkey Island series games by LucasArts.