http://www.history.army.mil/html/museums/uniforms/survey_uwa.pdf
Above link is the U.S. ARMY's archive of their uniforms from the beginning.
What bothers me about the uniform, are the trouser cuffs. It looks as if it is a borrowed uniform in my opinion.
Further, might be a uniform post Civil War or a chapter of GAR, etc.
Just some thoughts.
M. E. Wolf