Mike,
I think the flag to which you refer is the Polk flag carried primarily by Tennessee units. It also would have seen time in Ky, especially at Richmond and Perryville. This link has a good flat view of it with a history of the 1st Corp, Army of Tennessee - http://wwwdixiedawn.blogspot.com/2007/08/confederate-army-of-tennessee.html

Hope this helps. Tere are a lot of other western CS flags out there as well that are pretty neat. If I can help further, let me know.

Chris Propes