The official 2017 Scotland Rising Tartan Day Shirt. Our durable 5 oz super soft Ladies 100% cotton pre-shrunk t-shirt. Tartan Day is April 6th which is the date (in 1320) that the Declaration of Arbroath was drafted declaring Scotland as an independent nation. Recognized today to honor those Scots and their contributions to the world. Check locally for celebrations and have a great Tartan Day!