Was watching film of the Queen signing the new Canadian constitution and Bill of Rights back in the day and saw the Guard provided by 3R22eR wearing the bearskin headress.

I was of the impression that the bearskin was reserved for Guards unit only.

DT.

I believe that this is because the R22eR are affiliated with the Royal Welch Regiment.

The Van Doos follow Fusiliers tradition and wear a Busby with a badge. To anyone else they wear a Guards style bearskin cap but what can you do?
The cap came into wear shortly after the First World War when the CO, Vanier, sought a distinctive headdress. He went to Paris and found a cap that could be produced by a well-known milliner. However, the cost was prohibitive and payment was expected up-front. Militia Headquarters suggested that he approach an established British supplier as they were better known for supplying officers with goods and invoicing for these after delivery.
The cap was originally a Fusilier Busby but, over the years, these have grown into the full bearskin cap that is worn by regiments of Foot Guards in the UK and Canada.
An interesting sideline is that a Van Doo major complained, in writing, to HQ that Col Vanier had misled the officers and that the cost of the caps, which was to be $25., exceeded $50. by the time they were delivered. He basically stated that Vanier had lied and that he had profited from the transaction. By this time Vanier was posted to the High Commission in London and HQ queried the Major as to whether he 'really' wanted to pursue this and suffer the consequences of his groundless threats?
No more was heard from him.

Thanks, all, for the info.

DT.