Photo of Richard Lewis in Civil War Uniform?

One of the photographs we have of Richard Lewis shows a young man in a dark coat with a high collar and large round buttons. This looks very similar to the uniform worn by enlisted men in the Signal Corps during the Civil War.


Civil War photos for comparison (links open in a new window):
• Signal Corps Enlisted Uniform
• Signal Corps men at Washington, D.C. Central Signal Station
• Photo of Henry Sherriff from the Gettysburg Camp Life Exhibit

Of course it's possible that this was simply the fashion in the 1860s. Comments?

Earlier posts about Richard Lewis in the 2nd Pennsylvania Heavy Artillery and the Signal Corps.