In 1823 Mr. Charles Macintosh, a Scottish weaver & chemist, invented rubberized fabric. He is thus the creator of sensible rain gear. Today a Mackintosh (oddly respelled) is now synonymous with all raincoats.
Rhinos know that Scotland is not where Rain itself was invented, but they get quite enough of it there, that is for certain.
From a Rhino Point of View, a raincoat is overkill, given that Rhinos are Waterproof anyway. Still, it’s nice to be able to decide if you are wet or dry, yes?