Largest ever exhibition of the Queen's wardrobe planned for her 90th birthday

The Queen (center) at the wedding of Duke and Duchess of Cambridge. [Photo/Agencies]

For the wedding of the Duke and Duchess of Cambridge she wore a sunny yellow dress with sunray beading at the neckline, while at her great-grandson's christening she opted for a sky blue shade.

The Queen is estimated to have completed around 25,000 royal engagements in her lifetime, although some of these involved repeated outfits.

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Queen Elizabeth's colorful outfits