Bela's hood wearing a fedora
A fedora was a felt hat with a wide brim and indentations on top.
In 2268, all of Bela Okmyx's henchmen wore felt fedora hats. (TOS: "A Piece of the Action")
In 2381, Beckett Mariner overheard Steve Levy "mansplaining" the difference between a pork pie and a fedora to a cadet. She noted this to Brad Boimler when he asked if Jennifer Sh'reyan wore hats after viewing a nightmare version of a Jennifer as a werewolf wearing a fedora. (LD: "Mining The Mind's Mines")