If you thought that the Scottish tartan (you know, the striped cloth of which the pattern indicates the clan you’re from) is a tradition going back to times immemorial, you should read the chapter on it in the book The Invention of Tradition, edited by Hobsbawm and Ranger. The chapter describes beautifully how at some point in time there was no such thing as a tartan-tradition, and that ten years later it was an age-old tradition.
I liked the story – I even thought, and still think, it is hilariously funny in some ways. Read it, when you can. When I first read it, a long time ago, it also showed to me the capacity of us, human beings, to invent our past in ways that are fitting to our present. I was gripped, at the time, by the idea of showing the inventedness of many traditions, and even wrote an article on an evident invention of tradition: the invention of a Frisian folk song tradition by the group Irolt, a tradition which they then, although it was fake, could revive in order to create a Frisian folk revival analogous to the “second English folk revival”, specifically of groups like Steeleye Span and Fairport Convention.