The Regimental tartan is Hodden Grey, which has been worn since the Toronto Scottish Regiment became allied with the London Scottish Regiment in 1921. Hodden Grey, the homespun cloth known throughout Scotland, was chosen by Lt. Col. Lord Elcho of the London Scottish Regiment in 1859. He sought to avoid all interclan feeling on the subject of tartan, and as soldiers, wanted his troops to blend in with the landscape of the battlefield.
It is also referred to as the Royal Tartan because only two organizations in the world are allowed to wear it, and only with explicit permission by the Queen. The two organizations are The Toronto Scottish Regiment (Toronto, Canada), and The London Scottish Regiment - A Company, The London Regiment (London, England).