Scottish Register of Tartans

The Scottish Register of Tartans (SRT) is Scotland's official non-ministerial government department for the recording and registration of tartan designs, operating since 5 February 2009. As a governmental body, SRT is headquartered at General Register House in Edinburgh and is a division of the National Records of Scotland (NRS), formerly of the National Archives of Scotland (NAS) before its merger into NRS. SRT is the centralised agency for the recording of known historical tartans and for paid registration of new tartan designs, which must fulfill fairly stringent criteria.

Source: Wikipedia — Scottish Register of Tartans (CC BY-SA 4.0)