Baseball caps have been developed along with baseball sports. Baseball sports are a kind of ball sports that are characterized by sticking and playing, and are collective and confrontational. It is widely carried out internationally and has a great influence. It is known as the "combination of competition and wisdom." It is especially popular in the United States and Japan and is known as the "national ball." Because of the influence of baseball, baseball caps have also prospered with the development of baseball. According to years of research by experts in the United States, baseball is derived from British cricket (Cricket is also called Rounder). In 1839, American Doubleday organized the first game that was very similar to modern baseball. In the game, the players started to cover the sun with a hat. Because of its speciality, the hat is relatively long to block the sunlight and the eyes to get better results. This is the earliest baseball cap.