Baseball caps The first baseball caps were worn by the New York team, the Knickerbockers around 1840, and they were made of straw. Today baseball caps are made and of different fabrics and worn by people from all walks of life. There is no age t to the wearing of a baseball cap. Everyone from small children to seniors has adopted the cap. The caps are comfortable to wear and of fabric that makes adjustable for a good fit, and they are often them cool to wear on a hot day. Caps keep the sun out of uour face and protect you from the ran, but for many people, they are ako afashion statement.