... All the men in the photos are wearing a uniform...Perhaps too someone canI will not guess on the specific uniforms, but there was a sociological fact that
modern people may not realize--the military uniform (note especially the boots in
the pic) was often the best quality clothes that a young village youth had ever
owned. They were allowed to keep the uniform when mustered out (or of course if
they fled). This may be the simplest reason for wearing a uniform in old photos.
I remember on my first visit to the USSR in 1961 the Red Army jacket, stripped of
all insignia, was ubiquitous. Also, in the 50's I knew a WW I Russian veteran in
Los Angeles who showed me his army knickers, which he still wore on paleo digs.
The quality was incredible. As for the fedora, maybe he had lost his army cap and
had to wear something in the cemetery!