Thank you for asking! Originally all tartans would have been associated with a clan, but over the years they've changed and some modern, generic ones have crept in such as 'Flower of Scotland', 'Pride of Scotland' (bit of a theme, lol).
It's believed that Clan tartan as we know it was actually a 'fashion' item devised by two English brothers!
Dress Stewart (red) is the one you see the most worldwide and is the official tartan of the Queen - it can therefore be worn by any of her subjects.
Jumping down from pulpit now.
