Plaid wallpaper, derives its name from the plaid pattern, a pattern that is made up of 90 degree cross-crossed lines of different widths, is traditionally known as tartan in Scotland. What we call plaid wallpaper is derived from a Scottish tartan cloth that is worn over the shoulder as an accessory to a kilt.
Although plaid is most commonly associated with Scotland, the pattern actually dates back to ancient Celtic populations of the British Isles between the 8th & 6th centuries BC, where each clan or family had their own unique plaid design. Plaid made a comeback in the 1970s with the emergence of punk music. Today, plaid is back in style in both fashion and the home interior decor as plaid wallpaper.