"Dave Fossett" <reply@via.newsgroup> wrote ...
> I happened to flip through a book called something like "Eigo de trivia" in 
> the local bookshop today, and saw a section on the origins of "Gパン" 
> (jeans). The book claimed that this derives from "GI pants" since jeans were 
> introduced to Japan by American servicemen. 

It's a theory I've heard before.