In 1996 Admiral Sir Julian Oswald, a Scot and a former First Sea Lord at the instigation of Commander Hobbs of the Royal navy got Queen Elizabeth II to grant to officers and men of the Royal Navy the right to wear kilts of Scottish, Irish, Welsh, Manx and Cornish origins at mess dinners and certain ceremonial occasions provided they wore the Navy short coat of the uniform. However if they wanted to wear the kilt they had to buy it themselves!
http://www.iol.ie/~irishrts/Sample%20kilt%20pros.htm