 Middle-price suits are often made of wool-polyester blends, whilst the cheapest are made entirely of polyester fabric.This business suit (also known as the "sack suit" in North America, commonly by Brooks Brothers) became the standard business daywear for all men who were not engaged in physical labor.The waistcoat (British) or vest (American) was worn regularly with the suit up to World War II, but is rarely seen today, due to central heating in offices and the expense of construction.