This picture represents the mens work wear of the 1920s. They wore long pants and overalls and long sleeve shirts. This picture stood out to me because of how tough these men look. They are very intimidating looking and don't look like someone you would want to mess with. These men worked hard, long hours and were very good at their jobs.
Men (at least the highly fashionable ones) wore many accessories in the 1920s. Notice the different types of hats (here we see fedoras, straw boaters, and Newsboy hats). Canes were popular accessories as well as small rings, tie pins, and collar pins.