Many of the world's most famous hats have their origins in Britain; in the Middle Ages there were civil and religious laws requiring hats to be worn and in Victorian Britain a person would no more leave home without a hat than a pair of trousers. It is no surprise that London's oldest surviving shop, Lock and Co., is a hatter. From practical everyday caps and bonnets to military headwear, top hats, and even the coronation crown, hats of all sorts...