One of several variations on plaid, graph check is a fabric pattern consisting of horizontal and vertical lines in a single color that intersect at 90-degree angles to form a grid of evenly spaced squares. Named for its resemblance to graph paper, the pattern was first utilized by menswear designers for shirting fabric, though it is now also common in interiors. Graph check is similar to windowpane check, with the difference being that graph check is composed of thinner lines and smaller checks.