ROYAL COLLECTION TRUST/ © HER MAJESTY QUEEN ELIZABETH II 2016
Fashioning a Reign: 90 Years of Style from The Queen's Wardrobe, a new three-part exhibition, will show over 150 of Queen Elizabeth II's most memorable outfits. Here are some of the highlights on show.
ROYAL COLLECTION TRUST/ © HER MAJESTY QUEEN ELIZABETH II 2016
Pale blue silk faille evening gown by Norman Hartnell, worn at the Royal Lyceum, Edinburgh during the State Visit of King Olav of Norway.
ROYAL COLLECTION TRUST/ © HER MAJESTY QUEEN ELIZABETH II 2016
Evening gown embroidered with sequins, pearls, beads and diamante by Norman Hartnell, worn on a visit to the United States of America as a guest of President Eisenhower.
ROYAL COLLECTION TRUST/ © HER MAJESTY QUEEN ELIZABETH II 2016
Black silk velvet and taffeta dress by Ian Thomas, worn to meet Pope John Paul II at the Vatican.
ROYAL COLLECTION TRUST/ © HER MAJESTY QUEEN ELIZABETH II 2016
Evening dress by Norman Hartnell with a sash of Royal Stewart tartan, worn to the Gillies Ball at Balmoral Castle.
ROYAL COLLECTION TRUST/ © HER MAJESTY QUEEN ELIZABETH II 2016
Turquoise dress with a matching bolero jacket of silk taffeta, guipure lace and silk tulle by Norman Hartnell, worn to Princess Margaret's wedding.
ROYAL COLLECTION TRUST/ © HER MAJESTY QUEEN ELIZABETH II 2016
Silk evening dress entirely embroidered with beads and sequins with gold thread by John Anderson, worn to the Commonwealth Heads of Government reception held at the Palace of Holyroodhouse.
ROYAL COLLECTION TRUST/ © HER MAJESTY QUEEN ELIZABETH II 2016
Purple silk-wool coat with a green silk-crepe and lace dress, and a shawl of purple and green Isle of Skye tartan by Sandra Murray, worn to the official opening of the Scottish Parliament on July 1, 1999.
ROYAL COLLECTION TRUST/ © HER MAJESTY QUEEN ELIZABETH II 2016
Pink silk dress with white jacquard coat designed by Stewart Parvin, and pink hat by Philip Somerville, worn to a garden party.
CNN  — 

In celebration of her 90th birthday, the Royal Collection Trust is showing a side of Queen Elizabeth II that is rarely seen.

Fashioning a Reign: 90 Years of Style from The Queen’s Wardrobe,” a program of three exhibitions, will show over 150 of her most memorable looks, including ceremonial and military attire as well as wedding and christening outfits. This is the biggest exhibition of her personal wardrobe to date.

The first exhibition, which opens at the Palace of Holyroodhouse in Edinburgh on April 21, will focus on the use of tartan in the Queen’s dress. The other two exhibitions – opening at Buckingham Palace in August and Windsor Castle in September – will provide a more generalized look at royal couture worn at state and private functions.

Look through the gallery above for the Queen’s wardrobe highlights.