In Australian slang, "wifebeater" always referred to a dark blue singlet, such as is typically worn by truckers. It's only recently that we in Australia have heard the word coming from other parts of the world, and elsewhere it refers to a white singlet.
Tommo, the landscaper, was clomping about the backyard in his big blundstones, stubbies and a wifebeater.
by Daru April 18, 2007