The different hats available. Note: The hood has already been bought, but it costs 100 coins
Hats are trinkets in-game, which you can buy in the Armory. Trinkets are equipment that do not effect your gameplay, but are a way to show off to other players. The players weapon clips through most hats, it has been like this for a very long time.
There are 12 hats, including an option for no hat and 1 unobtainable hat known as the Observer Eye, see the video Brai The Kai Killer made and look at Egzekutor.