McGreggor Vintage 1970s Blue Plaid Blazer - 38" - Sizes as photographed - Heavy Polyester Background “Before McGregor there were roughly two ways of dressing: office attire or workwear. But playing golf or manning the barbecue doesn't go well in a three-piece suit. After McGregor there was American Sportswear.” Founded in New York in 1921, McGregor is a true American original, the first American sportswear brand with almost a century-old heritage.