If she asks, tell her it's a planter for the deck
Pat, it seems the term came from the jacket itself...
In British slang an anorak is a person, typically a man, who is an enthusiast interested in information regarded as boring or unfathomable by the rest of the population. The best known explanation of the term, is the use of anoraks (a type of rain jacket) by train spotters, a prototype group for this seemingly unfathomable interest in detailed trivia.
