Dark version of the submariner uniform and hat.
You’ve never seen this outfit and don’t know where to get it from?Fear not, I’m here to help!You’ll have to find the Yangtze submarine (google is your friend here) and kill the nice captain and then feel bad about killing him.
Or if your pickpocket skill is high enough you can probably just pick it from him.
Or do some good old cheating and add it via console by typing player.additem 118864 and player.additem 1188645.
