There are a few City Forces in Canada who have a designated mess dress. I know Calgary, Saskatoon, Winnipeg, and Toronto each have their own. The RCMP have mess dress for commisioned officers, while NCO's wear tunics with cloth belts.
Calgary also has a pattern of mess dress for their pipes & drums (highland mess dress). I haven't seen it anywhere else...
I'll try to post some pictures later.
JM