Over time, the word has evolved and changed its meaning, but it still retains its association with headwear.
As stated earlier, caps are typically designed with a visor which makes it perfect for keeping a person cool from the heat and sheltering a person's eyes from the sun, so it was a matter of time before they made it to the sports industry.
The first sport to adopt wearing caps was baseball, the hats were made out of straw and were worn on April 24, 1849, by the New York Knickerbockers.
However, within a few years time the team began to wear a cap made of fine merino wool, that featured a crown and an attached visor.
Sportswear found its way to fashion in the nineteenth century and on the contrary to what many believe it began to actually cater to the wants and needs of women.