PF,

The link says his name is Joseph. Which is correct, James or Joseph?

There was a discussion about the group prisoner photo of the camp that asked about the dress. In it mention was made of Morgan's men who might have been wearing captured clothing--according to Hugh one writer commented that "they (Morgan’s Raiders) are far better looking men than any of the secesh prisoners we had here before." So the link may or may not be correct in assuming that he was issued the clothes by the guard or some other voluntary Union source. (However, I suspect the link is correct because it appears to be a full uniform.)

Another way to approach this might be to see if other photos are known from this same photographer in Camp Douglas. This might narrow in on the time frame and help identify some candidate regiments.

Good luck!