From memory the fitted case was made at the time Queen Aexandra had the circlet altered. I don't recall colours.
The PoW feathers comment does seem strange.
Both Queen Alexandra and Queen Mary wore the Regal Circlet to their first State Opening of Parliament before their coronations.
--Previous Message-- : : ...used to be in the London Museum. : : It would appear that it now belongs in the : Royal Collection. : Well done !! : : : http://www.royalcollection.org.uk/collection/75003 :