Cornish kilts and tartans are thought to be a modern tradition started in the early to mid 20th century.
It is documented that a garment known as a bracca (a reddish checkered tunic) was worn by Celtic people (There were no people called 'Celts' The term 'Celts' is a modern 18th century notion derived from the similarities in what are known as the Celtic languages - spoken extensively in Ireland, Scotland, Wales, Man, Cornwall and Brittany, in the past).
He discovered carvings of minstrels dressed in what he interpreted as kilts and playing bagpipes on bench ends at Altarnun church, which dated from circa 1510.
The white cross on a black background is from the banner of Saint Piran, the patron saint of tinners, which is also used as the flag of Cornwall;[6] Black and gold were the colours of the ancient Kings of Dumnonia; red for legs and beak of the national bird, the Cornish chough, and blue for the blue of the sea surrounding Cornwall.
[7] A prototype of the Cornish national tartan was first worn by Morton-Nance in the 1963 Celtic Congress held at Carbis Bay attached to a Clan Douglas kilt that he was wearing for the occasion.