To my untrained eye, those jackets sure look close Sue.
Belle Boyd, a famous confederate spy, was photographed by Morris in the late 1800's.
The mustache and slicked down hair might also help date the pic, if the right someone was looking at it.
Reading around more, 1870's to 1880 is looking good for it. For the mustache, for the hair, for that cut of the "sack suit". So, with my skills based on 1 whole hour of google (lol) that's my guess.