Glen plaid (short for Glen Urquhart plaid) or Glenurquhart check is a woollen fabric with a woven twill design of small and large checks. It is usually made of black/grey and white, or with more muted colours, particularly with two dark and two light stripes alternate with four dark and four light stripes which creates a crossing pattern of irregular checks. Glen plaid as a woven pattern may be extended to cotton shirting and other non-woollen fabrics.
The name is taken from the valley of Glenurquhart in Inverness-shire, Scotland, where the checked wool was first used in the 19th century by the New Zealand-born Countess of Seafield to outfit her gamekeepers, though the name Glen plaid does not appear before 1926. Glen plaid is sometimes -- incorrectly -- nicknamed the Prince of Wales check, as it was popularized by the Duke of Windsor when Prince of Wales. The Prince of Wales check has another design.
Pee-wee Herman is famous for his light grey Glen plaid suit, and US President Ronald Reagan was considered "un-Presidential" in a gray-and-blue Glen plaid suit on a European trip in 1982.Cary Grant wore an iconic grey Glen plaid suit in the 1959 American spy thriller film North By Northwest.