But it's rarely the athletes representing those nations that take part in the mockery … unless you're Spain, whose Luchador-meets-McDonald's employee look has received shock and awe from its Olympians.
On the left is Saul Craviotto, a gold medal-winning canoeist, who tweeted this image of him in Spain's Olympic garb and offering a "no comment" about their look: "I leave it up to you."
(OK, if it was up to us, we'd say he was being attacked by a school of radioactive jellyfish.)
Retired tennis player Carlos Moya said, via Twitter: "Looking forward to seeing [tennis player] Feliciano López wearing the official Olympic uniform. He'll never have worn anything so ugly in his life."
Field hockey player Alex Fabregas tweeted the photo in the right, with a request to his fans: "Spare the adjectives ..."
Our first inclination was that these outfits were designed by a hyperactive child with a kaleidoscope; actually, they're the work of Russian firm Bosco, the designer for Russia and Ukraine's teams that donated these clothes to the Spanish Olympic Committee without compensation.