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):

 

 

Lime Green for D-Day Commemorations in Normandy

The Queen debuted a new lime green outfit for the 70th anniversary of the Normandy Landings.
On 6 June 2014, Her Majesty, accompanied by the Duke of Edinburgh, the Prince of Wales and the Duchess of Cornwall attended the Service of Remembrance at the Commonwealth War Graves Cemetery at Bayeux and met veterans. Afterwards, it was time for a lunch for the Heads of State and Government hosted by the President of the French Republic at the Château de Bénouville and then, in the afternoon, for the actual D-Day commemoration at Sword Beach (Ouistreham).
For the day's events, the Queen chose a chartreuse green coat and flower printed dress by Stuart Parvin, with a flower-embellished straw hat in a matching shade of green by Rachel Trevor Morgan.
For the group photo of the Heads of State, the Queen removed her coat to reveal a flower-printed silk dress underneath.
The addition of the impressive Queen Victoria's Fringe brooch completed the outfit.

 

The Queen with President Obama: