Where was waterproof fabric invented?

Clues:  A raincoat is called a mackintosh in Britain.  It rains a lot in Britain.  (Been there.  Experienced that.)  “Mac”-intosh.  (Scottish name.)

Right!  Charles Macintosh of Scotland invented rubberized fabric and first sold the coats in 1824.  Mackintosh (with a k) is the accepted alternate spelling for the coat.  Trust Google to commemorate this with a doodle.