Pastel Pink Tweed Angela Kelly for Engagements in Paris

On 5 June 2014, during their short State visit to France on the occasion of the 70th anniversary of the Normandy Landings, the Queen and the Duke of Edinburgh were received by French President Hollande at the Arc de Triomphe, where a wreath-laying ceremony at the Tomb of the Unknown Warrior took place.
The Queen looked pretty in a pastel pink, Chanel-style tweed suit with matching hat (a rather peculiar, sort of inverted-toadstool kind of hat), with cream leather accessories and her pink Williamson diamond brooch:

The Queen wore the dress on its own when she held audiences at Buckingham Palace on 13 October 2015 (below, she is shown with Her Excellency Professor Kate Warner, Governor of Tasmania, and her husband Mr Richard Warner). She wore the Cullinan V brooch:

On the 27 October 2015, the Queen repeated the suit, paired with black accessories, for a reception for the community of Commonwealth organizations she hosted together with the Prince of Wales at St James's Palace in London (Daily Mail article here). The Queen selected Queen Victoria's pearl pendant brooch to finish off her look:

It was the suit again, sans hat, for another Commonwealth engagement on 14 March 2016, the annual reception hosted at Marlborough House in London by the Secretary-General on Commonwealth Day (Daily Mail here, photos of the reception right at the bottom). This time the Queen wore one of Queen Victoria's diamond bow brooches:

With the Duke of Edinburgh and Commonwealth Secretary-General Kamalesh Sharma.

The Queen repeated the dress on 1 November 2016, to show Colombian President Juan Manuel Santos and Mrs Santos a Royal Collection display of artefacts relating to Colombia, at the start of the presidential couple's 3-day State visit to the UK (Dail Mail article here). She wore the Grima ruby brooch: