The Mackintosh is a type of raincoat invented by Charles Macintosh of Scotland in the mid-1920s. The waterproof properties of the Mackintosh coat are derived from impregnating or laminating cloth with a type of rubber.
Early Macintosh coats faced serious problems due to the infancy of the production techniques. For instance it was not uncommon for the rubber laminated layer on early coats to melt when exposed to moderate heat or for the cloth to pick up displeasing odors when exposed to moisture. In fact it took nearly 20 years and the creation of vulcanized rubber for these problems to be addressed in a satisfactory manner.
Though the original company has been bought, sold and merged several times throughout the years Mackintosh coats are still popular today. This is due to their excellent rain protection features as well as the fact that this style of coat is updated constantly in keeping with the times. Macintosh coats are defined by the type of rubberized fabric that they are constructed out of rather than any particular nod to fashion. So while a Mackintosh from the 1920s may be completely unrecognizable from a Mackintosh of the late 90s they are still technically the same style of coat so long as they are constructed out of the Mackintosh material.