A polo shirt is a type of casual shirt characterized by its short sleeves, a collar, and a placket with a few buttons at the neck. It is typically made from cotton or a cotton blend, providing comfort and breathability. The design is versatile, making it suitable for both casual and semi-formal occasions. Originally designed for tennis players in the 1920s, the polo shirt has since become a staple in many wardrobes. It is often associated with sports and leisure activities, but it can also be dressed up with slacks or skirts for a more polished look.