A plaid shirt is a classic wardrobe staple that never goes out of style. It typically features a pattern of intersecting horizontal and vertical stripes in a variety of colors, usually including red, blue, and green. The shirt can be made from a variety of materials, from lightweight cotton to flannel, and is perfect for layering over a t-shirt or wearing on its own. Plaid shirts are versatile and can be dressed up or down, making them a great addition to any wardrobe.