Since the thread is about Americans and allies, until Ivo t-boned it, and now we are discussing ties and pajamas, there was a cartoon some years ago, depicting what “casual” means to various nations. I wish I could find it. From memory, casual for the Brits means going from a tuxedo and bow tie to a regular suit and tie. The scale ends with Americans, where casual means ragged jeans and crumpled t-shirts.