A cap is a flat headgear. They made their first appearance as early as 3200 BC. The origin of the word "cap" comes from the Old French word "chapeau" which means "head covering". Over time, the word has evolved and changed its meaning, but it still retains its association with headwear. They are popular in casual and informal settings, and are seen in sports and fashion. They are typically designed for warmth, and often incorporate a visor to block sunlight from the eyes. They come in many shapes and sizes and are of different brands. Baseball caps are one of the most common types of cap.


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. This design became the prototype for caps of that time and still the most popular in present day. It's also not the only design for baseball hats but other sports as well, such as cricket, golf and tennis.
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. Sports cap however made an impact on the fashion industry around the 1980s when the company New Era, who had been designing hats for sports teams, began designing and selling hats to the general public. Baseball caps, fitted caps, snapback caps and truckers hats would then be seen in music videos, films, runways and even on Princess Diana's head, which helped nurture her appearance as the "people's princess." Along with hats, sports jerseys also became available in the 1980s as well, and now licensed apparel is a multi-billion dollar industry.

In Western societies, it has been traditional for men to remove their caps when entering a Christian church—a practice derived from 1 Corinthians 11 in the Bible. On the other hand, women historically were required to wear a headcovering when entering a Christian church (a practice that decreased in the West in the 1960s, though it still occurs in the East). Historically, men in Western Christian societies removed their cap when entering a room where women were present, as well as when a national flag is paraded. Men traditionally remove their cap when a funeral passes through an area in which they are present. Until World War I, it was customary for women to wear a white cap on her head, and women were rarely seen in public without one.
In modern slang, cap may refer to something that is false or untrue, while no cap refers to the opposite, something that is truthful.
Hat etiquette also has roots in Christianity, as it's long been considered customary for men to remove their hats upon entering a church. As we all know, however, church hats are a historic tradition for women to wear in the South.
In most forms of Christianity, however, men remove their hats as a sign of deference to the deity. The bareheadedness derives from the comments of the Apostle Paul in 1 Corinthians 11:4 that "a man who keeps his head covered when he prays or prophesies brings shame upon his head" (NEB).
In itself a church is as other buildings are; it is built of common bricks and stone, and common wood. Yet men remove their hats as they enter, speak in hushed tones, and move in reverent silence.
This is a trend that is not limited to Lutheran Christianity, but is seen in all of the historical communions, as well as among some Reformed and Anabaptist groups (in the case of various sects of Anabaptists, like Mennonites and Amish, women have been covering their heads - and not just in worship - for centuries). There is a small but stubborn resurgence of this practice.
Today many people associate rules about veiling and headscarves with the Muslim world, but in the eighteenth century they were common among Christians as well, in line with 1 Corinthians 11:4-13 which appears not only to prescribe headcoverings for any women who prays or goes to church, but explicitly to associate it with female subordination, which Islamic veiling traditions do not typically do. Many Christian women wore a head-covering all the time, and certainly when they went outside; those who did not would have been barred from church and likely harassed on the street. ... Veils were, of course, required for Catholic nuns, and a veil that actually obscured the face was also a mark of elite status throughout most of Europe. Spanish noblewomen wore them well into the eighteenth century, and so did Venetian women, both elites and non-elites. Across Europe almost any woman who could afford them also wore them to travel.
In European history, Christian women wore veils or other head coverings in church, in accordance with a biblical injunction (1 Corinthians 11:4–10).
Throughout the nineteenth century, hats were a cultural necessity; women were never seen in public without one. Up until World War I, a woman slipped on a white cap immediately upon arising, unless she was in mourning, and some type of hat or bonnet was worn every time she left the house.