Noun
ballcap (plural ballcaps)
A baseball cap.
The man, 26-year-old Rodney St. Gelais, was handcuffed at the time and was last seen wearing a black hoodie, a ballcap, tan khaki pants, white/grey shoes, and a light blue plaid jacket with snap buttons. Source: Internet
Or never remove their ballcap even when dining at a decent restaurant. Source: Internet