Jim, check out the "CS Enlisted Frock Coat" at http://www.heirloomemporium.com/csauniforms.htm.

The only thing is, it does not identify it as being used in a Mississippi Regiment.

What you might do is contact the Heirloom Emporium and ask if they know whether or not that black frock coat was used in any Mississippi Regiments.

I did not check their "catalog" or other links - that might be worth doing also.

Good luck

Dennis Boswell