Red Single Pocket Plaid Shirt A red single pocket plaid shirt is a type of shirt that is primarily red in color and features a plaid pattern. It typically has a single pocket on the front, usually on the left side of the chest. The plaid pattern consists of intersecting horizontal and vertical lines of different colors, creating a checkered or tartan design. This type of shirt is often made of cotton or flannel fabric, providing a comfortable and casual look. It can be worn by both men and women and is a popular choice for a relaxed, yet stylish outfit.