The main purpose of the baseball hat is to protect your eyes from the sun. That is the entire point of the hat yet people wear it in different ways.
The catchers had to wear the hat backward as they could not wear it frontwards due to the mask they had to wear. Wearing the had backward become a habit for most of the catchers but in the early 70s, this look became popular because of the movie Odd Couple in which Oscar Madison wore it backward.
Wearing the Chicago Cubs hat in various manners became a fashion statement. People started wearing hats for fashion instead of the purpose it was made for. In the 70's it became a glamour to bend the peak of your hat into a square, or triangle.
Then in the 80's it became fashionable to bend your hat into a round shape, which seemed more practical as it served the purpose of protecting your eyes from the sun.
Rap music became popular in the 90s and wearing the baseball cap backward became the trend and its purpose was only fashion. People started wearing the baseball hats sideways, backward, and wearing them frontward became rare.
Many people wore Javier Baez jerseys and Anthony Rizzo shirts with the Chicago Cubs hat to support the team.
The purpose of wearing the baseball hats frontward seems practical but wearing it backward and sideways had only one purchase "Fashion".
