Fuchsia Lightweight Coat with White Trim and Matching Straw Hats

This outfit is comprised of a block-colour fuchsia lightweight cover up with large white trimming
and a white and fuchsia silk dress with a geometric pattern. Two hats go with this outfit, both made of fuchsia straw; one is a toadstoll trimmed with a large fuchsia silk rose and white feathers, the other has a partially upturned brim and is trimmed with white and fuchsia bow loops and two fuchsia quills.

The Queen wore this ensamble with the first hat on 15 May 2008, on a visit to Kabatas School in Istanbul, before embarking on a boat trip down the river Bosphorus during a State visit to Turkey. An unidentified floral brooch was used:

The second hat debuted the following year on the second day of Royal Ascot, on 17 June 2009. This time the Queen wore the Cullinan V brooch:

 

On 4 June 2011, the Queen repeated the look to the Epsom Derby (Daily Mail article here). This time she accessorized with one of Queen Victoria's bow brooches:

 

 

The Queen wore this outfit again on 6 May 2016, on a visit to Berkhamsted School in Hertfordshire, on the occasion of its 475th anniversary (Daily Mail article here). She accessorized with her pink topaz and diamond brooch:

Yellow Stewart Parvin Outfit with Blue Accents

For the traditional Easter Sunday service at St George's Chapel, Windsor Castle, on 27 March 2016, the Queen led her family in a new Stewart Parvin outfit, comprising a bright yellow collared coat with gold domed buttons, pleated dress with a blue floral motif on yellow background and a hat by Rachel Trevor Morgan, in yellow straw with a gently upturned brim on one side. The piece is finished with a small yellow bow and blue flowers which tie in with the vibrant print of Her Majesty’s silk dress (Daily Mail article here). The Queen wore the Frosted Sunflower brooch to complement her outfit:

 

Surprisingly, the Queen recylced this look for Day 1 of the Ascot races, on 14 June 2016 (Daily Mail article here). Bookmakers were predicting she'd wear blue, instead she opted for this sunny ensamble, worn again with the Frosted Sunflower brooch, and we got a better look at the dress:

 

 

 

 

Cerise Stewart Parvin Outfit and Rachel Trevor Morgan Hat

On 20 April 2016, the eve of her 90th birthday, the Queen was joined by the Duke of Edinburgh on a visit to the Royal Mail delivery office in Windsor to celebrate the 500th anniversary of the British postal service, wearing a new outfit by Stewart Parvin and hat by Rachel Trevor Morgan.

The outfit is comprised of a cerise coat with gunmetal domed buttons and floral print silk dress on a white background, while the hat is cerise straw edged in contrasting pale green piping around the cartwheel brim and trimmed with a lavish posy of flowers and a pale green straw looped bow. The Queen wore her rose gold brooch (Daily Mail article here):

On 14 July 2016, the Queen wore the dress on its own (note the beautiful ruched detail) as she hosted the annual reception for recipients of the Queen's Award for Enterprise at Buckingham Palace (Daily Mail article here). She wore the Cullinan V brooch:

Lime Green Outfit and Orchid Trimmed Hat for 90th Birthday Celebrations

On 21 April 2016, the day of her 90th birthday, the Queen debuted a new hat and coat for the celebrations in Windsor, designed by trusted personal dresser Angela Kelly and described by Buckingham Palace as a “spring grass green wool and silk weave coat and dress with hat to match adorned with flowers”.
The coat is collarless and has hidden buttons and flap pockets. The hat is made of white straw trimmed with the same silk mix fabric as the rest of the outfit and a spray of white silk orchids.
The Queen accessorized with the diamond Jardine Star brooch and swapped the hat for a simple white silk scarf for the beacon lighting ceremony at dusk outside Windsor Castle (Daily Mail articles here and here):