A friend gave me a Canadian one, he was given a few while bagpiping for a Canadian remembrance parade.
In Britain they are more like
that, except they don't come folded up in the middle. Give a donation, get one, and pin it on.
Loads of people died during WW1, I expect there was a bit of British Generals being ruthless arseholes, as they are during every war (it's mildly effective).