Queens Consort do not change their attire during a Coronation, wearing a purple robe throughout, the only time they do wear their Coronation purple robe. Kings and Queens Regnant also wear their purple Coronation robe only on the day itself, donning it immediately before the Recession.
The second picture shows Edward VII and Queen Alexandra leaving Buckingham Palace for the Abbey on Coronation Day. The Queen has an ermine wrap drapped over her shoulders; it isn't part of her robe.
The first picture dates from February 1901 and was taken in the Robing Room of the Palace of Westminster at the State Opening of Parliament. The Queen is wearing her parliament robe of crimson; she is also wearing a black dress and crepe veil, in mourning for Queen Victoria, who had died the previous month.
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