This 40th birthday party invitation has been created using the Royal Stuart (Royal Stewart) Scottish tartan design. This tartan began its life as a 'Royal' tartan - that of the Royal House of Stuart - the personal tartan of the reigning monarch. Over the years it has become so popular and widely worn by all that it is now considered to be a Universal tartan (meaning that it can be worn by anyone who has no clan tartan). If you are interested in this invitation designed with a different tartan, please click on "wasootch" below, then send us a message through the "send message" link located on the sidebar of our Zazzle store. Please indicate the tartan details in your message. The text on this card is fully customizable. You can change the text using the personalize option. It's easy enough to use this for any milestone birthday, as you only need to change the text. For more extensive changes, such as font, font color, or text layout/placement, use the customize option. Reconnect with your Scottish roots with this tartan themed birthday party invitation. This card would also be nice for any other special occasion that you want to use a tartan theme to celebrate with. All you need to do is change the text.