Oh, you mean the whole tartan patterns on kilts identifying clans? Yeah, the Scots do seem to like to forget that that whole thing was basically an invention of English tailors for tourists going to Scotland back in the 19th century. Although there is a nod to the Celtic past in it, because the Celts did weave plaid (tartan) for awhile so it's not totally fraudulent. More like an exageration. You could identify areas of origin by the pattern of weave and dyes used due to different resources and weavers.
For the history lesson (as far as I recall )
Organised tartan patterns became a thing when one of the large commercial weaving factories became the sole supplier to the Highland Regiments (in about 1800 or so)- due to the large quantities they produced they started to develop standard patterns and colours, and give them names.
The clan tartans as a whole kicked off due to Scottish expatirates wanting to save/restore/recreate Scottish culture (partially led by Sir Walter Scott), you got the Highland Society in London wrote to the various clans asking for samples of their "clan tartans" because by then they thought the tartan pattern names actually did represent various affiliations.
Shortly thereafter, George IV visited Edinborough, led by the aforementioned Walter Scott in a kind of "I Love Me Some Scots" party, and then grew into a "tradition" and then tourism.