I am not too sure of the grammatical niceties and I would not be the least bit surprised if there is a difference between one side of the Atlantic and the other.I/we would say "the kilt "as singular.For example, I would say;"I wear the kilt to watch rugby" or "we wear the kilt to watch rugby".I would also say "I saw the Black Watch parade today wearing the kilt and so was I".Any help?