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:

Turquoise and Blue Angela Kelly 'Neon' Outfit

This Angela Kelly outfit features a rather striking contrasting combination of electric blue and bright turquoise, it's almost a 'neon' look for Her Majesty, and one that ensures she's highly visible during engagements. The hat is mainly electric blue, with turquoise piping and a blue and turquoise yarn trim as a decorative feature, whereas the coat is mainly turquoise, with the collar, flap pockets and piping down the centre front being electric blue. The coat buttons have a geometric, somewhat Mondrian-esque motif.

The Queen debuted this look on a visit to Manchester on 14 November 2013, accessorizing it with the Jardine Star brooch (more photos and a video on the Manchester Evening News page here):

 

Then, the following year, on 29 April 2014, Her Majesty wore this ensamble again on a visit to Cotts Farm Equine Hospital in Narbeth, Wales (Daily Mail article can be found here). This time the coat was jazzed up with the Pearl Trefoil brooch:

 

It was another equestrian engagement for this look when the Queen selected it again on 18 October 2014 for the British Champion's Day at the Ascot racecourse. For this occasion, Her Majesty opted for a not-often-seen brooch in the shape of a floral bouquet made up of multi-coloured stones:

 

This close up provides a peek of the pattern of the dress:

 

 

The next time we saw the Queen wear this outfit was on 11 January 2015, for Sunday Church at St Mary Magdalene on the Sandringham Estate (Daily Mail article here). The Queen Mother's Palm Leaf brooch was used:

 

 

Her Majesty repeated the look a couple of months later, on 26 March 2015, for a visit to the National Memorial to the Few in Capel-le-Ferne, Kent (Daily Mail article here), followed by a visit to Canterbury Cathedral, where stautes of the Queen and the Duke of Edinburgh by Norfolk artist Nina Bilbey, commissioned to mark the Diamond Jubilee, where unveiled (Daily Mail article here). The Queen wore one of Queen Victoria's Diamond Bow brooches:

The coat and dress then made a solo appearance at a traditionally hatless occasion, the Chelsea Flower Show, at a preview on 18 May 2015. As has become customary in recent years, the Queen wore a brooch in the shape of an Iris Unguicularis, the floral symbol of the Chelsea Flower Show, a present from the Royal Horticultural Society on the occasion of the Diamond Jubilee. Prince Harry accompanied the Queen on a tour of the garden designed for his charity, Sentebale (Hello! magazine article here):

Most notably, the Queen chose this outfit for her historic appearance on 9 September 2015, the day when she became the longest reigning monarch in British history, taking over from her great-great-grandmother Queen Victoria (Daily Mail article here). The Queen was greeted by cheering crowds as she boarded a steam train at Waverely Station in Edinburgh, en route the village of Tweedbank, where she opened the new £294million Scottish Borders Railway. Appropriately, she wore one of Queen Victoria's diamond bow brooches:

 

 

Turquoise Coat and Rachel Trevor Morgan Hat with Red Rose

A turquoise wool 3-button coat in a classic cut, with turned-up cuffs, complete with a Rachel Trevor Morgan straw hat with a large turquoise velvet sash trimmed with an oversized red silk rose and wispy red and turquoise feathers. The matching silk dress has a floral pattern in magenta and green on a turquoise background.

The Queen debuted this look on 19 October 2006, when she chose it for her arrival in Tallinn, Estonia, during a visit to the Baltic Republics. The Australian Hibiscus brooch was selected (this is a look that allows great versatility in stone colours, thanks to the turquoise/red combo):

With Estonian President Toomas Hendrik Ilves:

Then it was worn again on 22 June 2007, Day 4 of the Ascot races, paired with one of Queen Victoria's Bow brooches:

 

Then it was repeated the following year, on 5 June 2008, for a series of engagements in Cumbria. The Cullinan V brooch completed the look:

 

 

Then, on 6 May 2009, the Queen stood out in her turquoise outfit among the red coats of the Irish Guards, when she presented new colours to the 1st Battalion Irish Guards at Windsor Castle. For this occasion, the badge of the Irish Guards was selected as a brooch:

 

 

Later that same day, the Queen, accompanied by the Duke of Edinburgh, travelled to Northern Ireland for a 3-day visit; for this second engagement, she wore the Nizam of Hyderabad Rose brooch:

 

The Queen repeated this look once again later that year, on 13 June 2009, when she wore it for Trooping the Colour, paired, as usual, with the Guards' badge:

 

 

A year later, on 20 May 2010, the Queen repeated the ensamble for a day of engagements in Yorkshire:

 

The following month, on 14 June 2010, the Queen made an appearance at the Guards' Polo Club in Windsor for the Queen's Cup match, accessorising her coat with the Flower Basket brooch

Interestingly, the Queen drove herself to the event (and...shock, horror! She didn't wear her seat belt!):

 

 

The Queen recylced the look again on 14 July 2010 to attend a livestock show at Castle Douglas, in Galloway, Scotland. The Jardine Star brooch was worn:

 

 

On 17 July 2012, we got a proper view of the dress that goes with this coat, when the Queen wore it for an audience at Buckingham Palace with Mrs Aloun Ndombet-Assamba, the High Commissioner for Jamaica. It looks as though the Pearl Trefoil brooch was used:

 

 

 

Angela Kelly Turquoise Suit with Scalloped Hem

Another great Angela Kelly suit for the Queen: both the dress and the jacket are in turquoise silk and feature scalloped hems with multi-colour embroidery. The dress, moreover, has rainbow embroidery all over. The multi-coloured detail is picked up with the hat as well, which is a flat-crowned style trimmed with ombré curling feathers.
We first saw this outfit during the most recent Canadian tour, on 4 July 2010, when the Queen and the Duke of Edinburgh visited Woodbine Racetrack in Toronto for 151st Running of The Queen's Plate Stake. The City of London Lily brooch was worn:

 

On 11 May 2011 the Queen hosted a reception to recognise young people working in the British Performing Arts at Buckingham Palace, which she attended wearing the dress by itself, accessorised with one of Queen Victoria's Bow brooches. During the event, the Queen met, among others, actress Helen Mirren:

 

 

On 1 June 2011, the Queen wore the dress and jacket again for an investiture ceremony at Buckingham Palace, during which she appointed Sir Jerry Mateparae, then Governor-General Designate of New Zealand, as Additional Knight Grand Companion of the New Zealand Order of Merit. The Queen, predictably, wore the New Zealand Silver Fern brooch:

 

 

On 5 July 2011, the dress got another outing when the Queen wore it to an investiture ceremony at the Palace of Holyroodhouse in Edinburgh (below, the Queen with George Walker as he presented him with an OBE for charitable services):

 

 

We didn't see this worn again for quite a long time, until the Queen repeated the outfit on 28 October 2013 at a reception for Commonwealth nations representatives at Buckingham Palace. Below the Queen is seen speaking with Commonwealth Secretary General Kamalesh Sharma. This was also the first time we saw a relatively new addition to the Queen's brooch collection, a gold, diamond and blue pearl creation by Eyris Pearls, a personal gift from New Zealand Prime Minister John Key. The brooch was a truly fitting choice, as the shade of the pearl matched perfectly the blue of the dress:

 

 

On 29 May 2014, we again saw the suit, complete with a brooch in gold filigree, at another Buckingham Palace reception, this time for Leonard Chesire Disability, where the Queen met, among others, Professor Stephen Hawking. A brooch in gold filigree was chosen:

 

 

Only a few months later, 17 July 2014, the outfit was worn again to re-open the renovated railway station at Reading, Berkshire. The Eyris pearl brooch was worn again:

 

This was a perfect choice, as it allowed the Queen to truly stand out among all the high-visibility clothing in the group photos:

 

 

The dress alone was worn again on 21 July 2015, when the Queen received Jocelyn Roy-Vienneau, upon her appointment as Lieutenant-Governor of New Brunswick, Canada. One of Queen Victoria's bow brooches was used: