A baseball shirt, also known as a baseball jersey or a button-up jersey, is a specific type of shirt traditionally worn by baseball teams during games. These shirts are characterized by their button-down front closure and collared neckline, resembling classic button-up shirts. Baseball shirts are usually made of lightweight materials such as polyester or moisture-wicking fabric to ensure breathability and comfort during physical activity on the field. They often feature team names, logos, or player names on the front and back to represent each individual player or team identity. While originally part of team uniforms, baseball shirts have now become popular as casual wear due to their nostalgic appeal and association with America's favorite pastime.