It appears that the first photo is from a parade of the 1st Hussars to commemorate D-Day. These are some better quality images of the tartan, with perhaps some other details in their insignia that may help pin down the tartan. You can enlarge the photos on each page.
https://www.alamy.com/stock-photo-lo...-69785598.html
https://www.alamy.com/stock-photo-lo...-69784953.html
https://www.alamy.com/stock-photo-lo...-69785577.html
https://www.alamy.com/stock-photo-lo...105103840.html
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