On looking at the photos a bit more closely, a few things stand out. First, they are wearing or carrying coats, even though they were supposedly captured at Gettysburg (presumably in July). Confederates were known for disgarding their coats or anything else which they didn't want to carry, on the assumption they could always pick up another one when it was needed (short jackets which were part of a uniform excepted). Secondly, the fellow on the left is carrying a water cup, which is historically accurate as the preferred means of carrying water, but he's also carrying a canteen. Confedertes often disgarded canteens as they figured the cup did the job more efficiently (except when carrying "found" mollassas, liquor, etc.).
As for the bands on the finger of the middle guy, I have know idea what that is.