national costume
From Longman Dictionary of Contemporary EnglishRelated topics: Nationality & race, Clothesnational costumeˌnational ˈcostume noun [countable, uncountable] SANDCCspecial clothing traditionally worn by the people of a particular country folk dancers in national costumeExamples from the Corpusnational costume• Stout Mrs Muller, in her national costume, sang.• Waiters in the silver national costume of Luctia bowed stiffly as they placed dish after lavish dish in front of the delegates.