national costume

plural national costumes

1. Clothing of a particular style and colours worn to represent a country at international events, or as part of national celebrations.

   1 more example

   When it arrived, the train was headed by a "K" class 4-6-0 wood-burning locomotive, and a water-tank wagon next to the tender was immediately besieged by women and girls, clad in their picturesque national costume, all with empty kerosene tins for water, a scene which was re-enacted at each stop down the line.

   1943 November and December, G. T. Porter, “The Lines Behind the Lines in Burma”, in Railway Magazine, page 325