Labour Day: the holiday Canada gave the world

Driving to the airport to pick up our visitors, we were so busy chatting and listening to the radio we forgot to turn off for the airport and were somewhere else that wasn't even on the map.
One of the adverts in particular got my attention. It was for beer and listed, increasingly fast, all the things to do this Labour Day weekend, which can't be done after Labour Day. I can't remember most of it, but the list included "wear white, go fishing at the cottage, work on your tan, tip a cow, buy cheap beer...."
I don't know if the 'no white after Labour Day' rule has any fact to it, I only know about it from the movies.
So do scientists have other colour coats to wear after Labour Day?


We made it to the airport, by the way, with about 5 minutes to spare.