When I go SCDing in full formal rig like this I usually find myself discarding the PC jacket and waistcoat after the first dance or so - say by the first strathspey. And I notice that many others take the same approach.

Maybe we are just more uncouth around here. I admire your dedication to good form but the vigorous exercise you get doing 20 dances in rapid succession is enough to soak me in sweat if not well ventilated and that does nothing for my appearance either!