Turquoise Stewart Parvin Outfit and Angela Kelly Floral-Trimmed Hat

For her fourth State visit to Malta in November 2015, to coincide with the biennial Commonwealth Heads of Government Meeting (CHOGM), the Queen debuted a series of new outfits (discussed here and here), including this bright turquoise one by Stewart Parvin, set off with a hat by Angela Kelly, worn on the last day of the visit, 28 November 2015, and accessorized with her turquoise and diamond brooch.
Comprised of a collarless coat with patch pockets (a style of which HM seems to be particularly fond), a printed silk dress and a hat with a gently sloped crown covered in the same fabric as the coat and an upturned brim in matching turquoise straw, trimmed with a small posy of white and blue flowers tied together with a blue silk ribbon bow.

On the last day of their visit to the island where they spent the early days of their married life, the Queen and the Duke of Edinburgh undertook a series of engagemnts, including a tree-planting ceremony, a visit to the National Agency for Malta's Cultural Heritage, where they viewed items being preserved for future generations, a tour of HMS Bulwark at Customs Wharf and a game of polo at Marsa racecourse (Daily Mail article here):

 

On 6 July 2016, the Queen repeated the look on a visit to Dundee during the annual Holyrood Week, a series of engagements in Scotland (Daily Mail article here). She wore one of Queen Victoria's Bow brooches: