The Queen's 90th birthday festivities continue as Buckingham Palace hosts a beautiful display of some of her most iconic outfits. Fashioning A Reign: 90 Years of Style from the Queen's Wardrobe won't open to the public until July 23, but the palace gave an exclusive sneak peek of the exhibition on Tuesday (July 5).

It is the second of three exhibitions showcasing HerMajesty's most-treasured outfits from her childhood to the present day, andwill "show the unique requirements of royal couture" with a mix ofhistorical items including iconic designs from Sir Norman Hartnell and Sir HardyAmies.

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One of the most recognisable outfits is the dress and coatworn by the Queen for the wedding of the Duke and Duchess of Cambridge in April2011. The outfit was designed by Angela Kelly and is on public display for thefirst time.

Also included is a pale blue and gold evening dress worn bythe Queen on a state visit to the Netherlands in 1958, and a turquoise silkshift dress with silver floral embroidery that was created for the Monarch byHardy Amies.

One piece that is at odds to the glamorous dresses is the uniformthat the Queen, then Princess Elizabeth, wore while serving in the AuxiliaryTerritorial Service (ATS) during the Second World War.

The exhibition will go on display as part of the annualsummer opening of the State Rooms at Buckingham Palace at the end of July,while the final exhibit will take place at Windsor Castle in September.

The first of the three exhibitions, Tartan in royal dress, opened on April 21 at the Palace ofHolyroodhouse.