Why is a raincoat called a MACKINTOSH?

A raincoat is called a "Mackintosh" after Charles Macintosh, a Scottish chemist who invented a waterproof fabric in the early 19th century. He developed a method of bonding two layers of cloth with a layer of rubber, creating a practical and effective rain-resistant garment. The term "Mackintosh" eventually became synonymous with waterproof coats, especially as his designs gained popularity. Today, it is often used to refer to any type of raincoat.