The phrase "windowpane pattern" refers to a type of design or pattern that resembles a grid of squares, similar to the panes of glass in a window. Full definition
The material is medium - weight, pretty stretchy, and unlined with windowpane pattern printed onto it — oh, and the dress is machine washable! (extrapetite.com)
Taking the dive into a full windowpane pattern suit takes some balls, but, can be done easily with the right fabric choice & base color. (mensstylepro.com)
Tailored in a fine wool and silk blend, this stylish sport coat has a classic notch lapel and a subtle brown windowpane pattern. (menswearhouse.com)