Masks are a wearable item found in Apocalypse Rising that were added along with hats in the Hat Update. Masks are a wearable item that goes on the face and around the head (so things like bandanas and eyewear still count) for thier counterparts. See the Hats page. You may also spawn with a mask using credits.
Special Forces mask
Mime Mask (Not technically a bandit mask, but it does look creepy.)
Red Bandanna (Note, technically should be considered civilian, but due to its prior feature as a sign of banditry, people tend to take it as that.)