The Lorne Scots do not wear Campbell of Argyll, but Campbell. Its like Black Watch but in lighter colours. The A and S in the UK wore this tartan until 20 years ago I believe. The Marquess of Lorne - who married a daughter of Queen Victoria, was a Governor General of Canada in the 1800s, and "Lorne" was a popular name for boys here for many years.

And the Toronto Scottish - who modelled themselves after the London Scottish - who I believe vanished after WW1, call their tartan "Hodden Grey."

It is quite plain - a brownish grey without any pattern at all.

Great photos in this thread.

Readers should also know that despite lots of keenness these are not large units - they muster 200 on a good night. Many of the soldiers have served in Afganistan, but I very much doubt any of these reserve units would ever go into battle as a formed unit. They're just too small. What these soldiers do add when mixed with regulars are often some rare civilian skills - particularly amongst the officers.