They had walked in single file down the path, and even in the open one stayed behind the other. Both were dressed in denim trousers and in denim coats with brass buttons. Both wore black, shapeless hats and both carried tight blanket rolls slung over their shoulders.

– John Steinbeck

Of Mice and Men, Chapter 1. First descriptions of George and Lennie. They dressed identically and had much in common because of their close friendship.