Aqua Printed Silk Dress and Jacket Combo, Quill-Trimmed Hat

This is a very versatile outift: a silk dress and jacket combo made from a fabric with a delicate, naturalistic floral print in pretty shades of aqua, blue and green and a baby blue bouclé coat and quill trimmed straw hat.

The dress, coat and hat combo was worn to a garden party at the Palace of Holyroodhouse in Edinburgh on 28 July 2005, together with the City of London Lily brooch:

The Queen wore this outfit again, in its dress and silk jacket combination, for a children's garden party at Buckingham Palace on 25 June 2006, part of her 80th birthday celebrations, paired with her Pearl Triangle brooch. During the event, the Queen and the Duke of Edinburgh met several well-loved children's books characters, including Postman Pat, Thomas the Tank Engine and Alice in Wonderland's White Rabbit (Daily Telegraph article here):

On 25 June 2008, the Queen was seen wearing again the dress when she received Nelson Mandela and his wife at Buckingham Palace. I'd say she was wearing the Pearl Trefoil brooch, although it's difficult to tell for sure:

The Queen wore the dress again on 4 May 2011, for audiences at Buckingham Palace (below, with the Ambassador of the Slovak Republic Miroslav Wlachovsky). She accessorized with her Boucheron aquamarine and diamond clips: