Quote Originally Posted by MacMillan of Rathdown View Post
I would agree that it isn't necessarily disrespectful, but it is pretty much in the same boat as wearing a regimental tie-- okay if you served in the regiment, but a social no-no if you didn't. As far as the Regiment "no longer existing" I wouldn't be too sure; it may exist merely as a Company in the RRS, or as a TA or Cadet unit.
Some civilian pipe bands (U.S., Canadian, etc) use Highland Regimental badges as a part of their uniform.