The hats are in the "widebrimhat" folder and have two variants, the Nameless (Nameless and Shadowsun) and the Gunslinger (the 3*,4*, Justifier and Deadshot).

The ponchos are in the "poncho" folder. They share the model with the Magic line of cloaks, so you'll have to check the variants to see the Gunslinger ponchos. The variants in there are: Cowboy Gunslinger (3*), Cowboy Yellow (4*), Cowboy Epichero (Nameless), Cowboy Justifier (Justifier), Cowboy Silver (Deadshot) and Cowboy Villain (Shadowsun)