Not to be confused with a Macintosh computer, a Mackintosh is a form of waterproof raincoat, first sold in 1824, made out of rubberized fabric. It is named after its Scottish inventor Charles Macintosh, though a letter k is commonly added. In the present day, the Mackintosh style of coat has become generic, but a genuine Mackintosh coat should be made from rubberized or rubber laminated material.
Intrigued? See more original Mackintosh raincoats.