I was recently sent this photograph from Capt. Sir Malcolm MacGregor of MacGregor. It depicts his grandfather, then chief of the clan, in Edinburgh in 1953 preparing for the Coronation of Elizabeth II. With him in the photo, adjusting his feathers, is his son (Malcolm's father, aged 28 at the time), who is wearing the uniform of the Royal Company of Archers.
Thanks to Sir Malcolm for allowing me to share this photograph from his family's archives!