One of several variations on plaid, windowpane is a fabric pattern consisting of horizontal and vertical lines that intersect at 90-degree angles to form a grid of squares that are scaled to resemble the evenly divided panes of a window—hence the name. The density and coloration of the squares may vary, and occasionally the grid may appear to be formed by rectangles rather than perfect squares. The pattern is similar to graph check, but the intersecting lines that form windowpane are usually thicker and farther apart. First popular in menswear, particularly for suiting fabric, the motif is now also found in other textile applications.
