Royal Blue Peter Enrione Coat and Aqua Hat by Angela Kelly

For her arrival at Berlin Tegel Airport on the evening of 23 June 2015, at the start of a four-day State visit (Daily Mail article here), the Queen selected a new ensamble, comprised of a collarless coat with strongly asymmetrical buttoning in a rich shade of royal blue and a silk paisley print dress on aqua background, both by Peter Enrione, set off with an aqua straw hat by Angela Kelly, with the crown overlaid in pleated sinamay to resemble a layer of organdy, upturned brim and blue silk rose trim. For her first appearance in this outfit, the Queen accessorized with Queen Victoria's sapphire and diamond brooch:

 

 

One of the Queen's hatboxes being carried off the plane.

 

The Queen repeated the look on the final day of the Royal Ascot races, on 18 June 2016, pairing it with the Jardine Star brooch (Daily Mail article here):

 

 

 

Floral-Printed Suit for UN Speech

For her first speech at the United Nations in New York in more than 50 years, on 7 July 2010, the Queen chose a gorgeous flower printed silk flounced dress and jacket combo in an aqua and mushroom palette, with a matching mushroom coloured hat with an upturned aqua brim and floral trim to one side. Her Boucheron aquamarine and diamond clips provided the perfect accessory:

 

The Queen addressing the UN General Assembly in 1957 and in 2010.

 

 

With then-UN Secretary General Ban Ki Moon.

 

Later, the Queen met then-Mayor Micheal Bloomberg and visited Ground Zero, where she laid a wreath and opened the British Garden of Remembrance in nearby Hanover Square:

 

 

 

 

The outfit, with the addition of a colour-block mushroom silk crepe coat accessorised with the Jardine Star brooch, was repeated on 25 October 2011, when the Queen visited the Australian War Memorial in Canberra:

 

The Queen was accompanied by General Peter Cosgrove, Chairman of the Australian War Memorial Board:

 

It would appear the Queen later had the dress remodeled to remove the bottom frills, and in this altered version had two dresses made in the same silk fabric, one without frills, and she wore it to receive in audience at Buckingham Palace Theresa May and request her to form a new Administration upon David Cameron's resignation as Prime Minister on 13 July 2016 (Daily Mail article here). She wore the round Cambridge Emerald brooch with pendant:

The frilled-hem dress reappeared on 19 July 2016, worn to a private drinks reception at Drapers' Hall in central London, which was intended to be a final 90th birthday get-together for the monarch before heading to Balmoral in Scotland for her summer break (Daily Mail article here). She wore her diamond and pearl navette brooch: