This character wears a baseball cap.

A baseball cap is a type of soft cap with a long, stiff brim that may either be curved or flat. The front of the cap typically contains designs or logos of sports teams (namely baseball teams). The back of the cap may be "fitted" to the wearer's head size or it may have a plastic, Velcro, or elastic adjuster so that it can be quickly adjusted to fit different wearers.