International Tartan Day is held on July 1, the anniversary of the repeal of the 1747 Act of Proscription that banned the wearing of tartan. In efforts to assimilate the Scottish Highlands, the British Parliament enacted several ‘King’s Laws” which sought to crush the Clan system. These laws were finally repealed on 1 July 1782.

The Illustrated Encyclopedia of Tartan: A Complete History And Visual Guide To Over 400 Famous Tartans
by
Iain Zaczek
Available at Amazon