I was trying to find info on this a couple of weeks ago as well. Then the last night while looking up some other info on rat and quarters I found the page that that link went to:
As far as I read (and my Sgt) the restrictions on wearing the uniform while not on duty really only applies to members of the reserves but it is really a grey area.
Let me know what you think.
PS: Luckly I have a pair bought from a surplus store so if I do decide to use them for a game I don't have to wreck my issued ones.