The timeline of the baseball hats

A baseball cap is a type of soft cap with a rounded crown and a stiff bill projecting in front.

The front of the cap typically displays a design or a logo (historically, usually only a sports team, namely a baseball team, or names of relevant companies, when used as a commercial marketing technique).

The cap may be “fitted” to the wearer’s head or the back may have elastic, a plastic prong-in-a-hole (multiple holes with one prong that can be inserted), Velcro, a zipper, or a tri-glide slide so that it can be quickly adjusted to fit different wearers’ heads.