Ahhhh games knickers 
I was once berated by a teacher for not wearing my school knickers under my tennis skirt. Which meant, of course, that she was looking up my skirt. Perv.
And before the little kilt-type games skirts, we had woollen culotte style things which chafed on a cold winter's day...
My kids don't know they're born, with their tracksuits and moisture-wicking ensembles.