That does make sense. My problem with all of this relatively early stuff is that I had difficulty in finding the primary source. perhaps you have had more success but there are a series of references that point to documents that just do not seem to exist. There definitely were covers prior to 1892. Were they issued to the entire army? Were they reserved for the fall maneuvers? I don't know.
The original covers were allegedly authorized by an AKO dated 8 May 1884. The purpose of this was to have some way of marking sides during maneuvers. The solution that was used was to equip one side of the maneuvers with a white cloth cover. There is an example of this cover located in the museum in Rastatt.
http://pickelhauben.net/old-site/articles/images/uberzug/1884%20model.jpg
The problem is that there was no AKO in 1884 that authorized these Uberzugs. At least I have been unable to find it. Therefore, I do not know whether the authorization extended throughout the army, just for the Kaiser maneuver, or only for a specific group. They surely existed, and they surely were for maneuver purposes, but there was no AKO.
Perhaps Glenn might find something in the uniform regulations.
ps707 by
Joe Robinson, on Flickr
Not only was this the first picture found. there is also a drawing of one in the Rochling Prints. these are undated. However they highlight a picture of Georg Leo Graf von Caprivi de Caprera de Montecuccol. an interesting guy, who had a running feud with Bismarck. As a result, this army general was appointed as the head of the Imperial Navy even though we had no experience. Caprivi followed Bismarck as the Chancellor during the years 1890 – 1894. So that cover was in use to at least 1890.
Röchling27 by
Joe Robinson, on Flickr
these same cover was seen on another picture originating with JR 60.
ps1750 by
Joe Robinson, on Flickr
ps1750b by
Joe Robinson, on Flickr
There is no date on this card.
I was in the process of looking up where JR 60 fell in the fall maneuvers as the first unit obviously wore Litzen. specifically, you could determine JR 60s participation in the annual Kaisermaneuver. I don't know if that would prove anything definitively but it would at least be an interesting point of data. However, I decided to move on to other things when a certain member of this forum decided to rule ex cathedra on all things Uberzug.
In summary, I think there were covers well-documented in photographs prior to 1892. Finding the authorization documents has been elusive if they exist.