Having grown up in the northern hemisphere I have a particular mental image of Father Christmas/Santa Claus/Saint Nick/whatever. It involves a lot of clothing, topped with a lined robe. Y’know, typical cold weather gear.
In the southern hemisphere, do you get the same? If so, how come the poor guys cosplaying as him don’t overheat?
No, but I’d wager there’s at least one mall in the southern hemisphere that employs at least one Santa, making your assertion incorrect.
That’s not really “everywhere”. Not all 180-200 countries have them.