The Arrow man and his shirts and collars. The debate for soft vs stiff collars battled during the 1920's. The soft collar eventually won. http://www.vintagedancer.com/1920s/1920s-mens-fashion-history-begins
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.