Plaid patterns are designs made up of crossed horizontal and vertical lines that create a grid-like appearance. These lines often vary in color and thickness, resulting in a variety of styles. Plaid is commonly associated with fabrics, such as those used in tartan clothing, and is popular in both casual and formal wear. The origins of plaid can be traced back to Scotland, where it was traditionally used in kilts and other garments. Today, plaid patterns are widely used in fashion, home decor, and accessories, making them a versatile choice for many different applications.