When searching based on description of the looks of Maxima and the 3 A's I could find the following:
- The dress Ariane is wearing is IMO the one pictured below. The 3 A's were spotted in it at the (religious) wedding of WA's cousin prince Jaime de Bourbon Parma & Viktoria Cservenyak in 2013 in Apeldoorn, the Netherlands
- Alexia seems to wear a dress similar to the one she wore at Kingsday 2017. But the one on the picture seems darker of color and has longer sleeves.
Screenshot, taken from the tv, from the same family picture shown during WA's interview
This screenshot comes from a Dutch language royal fashion blog. On it the outfits of Maxima and the 3 A's in the specific picture are discussed. It even pinpoints the moment the picture was taken! http://royalfashionblog-t...s/category/prinses-amalia
"...Tijdens het interview met de Koning wat vanavond ter ere van zijn 50e verjaardag werd uitgezonden, was een nieuwe gezinsfoto te zien. Op de foto was het Koninklijk gezin te zien bij het avondfeest ter gelegenheid van het huwelijk van Marianna Goulandris in Londen. Prinses Amalia is hier te zien in een nieuwe, vermaakte jurk, van Needle & Thread. Prinses Ariane draagt een jurk van Pili Carrera, die eerder is gedragen door Amalia of Alexia. De drie zussen droegen namelijk alle drie deze jurk bij het huwelijk van Prins Jaime en Prinses Viktoria de Bourbon Parme..."
"... During the interview with the King which was broadcasted in honor of his 50th birthday tonight, a new family photo was featured. The photo featured the Royal Family at the evening party on the occasion of Marianna Goulandris's marriage in London Princess Amalia is featured in a new, entertaining dress of Needle & Thread. Princess Ariane wears a dress by Pili Carrera, previously worn by Amalia or Alexia. The three sisters weared all three of this dress at the wedding of Prince Jaime and Princess Viktoria de Bourbon Parme ..."
The wedding of Filippos Lemos and Marianna Goulandris took place on February 4, 2017 in London. Alexia and Ariane were bridesmaids at this wedding:
While Amalia wore the same outfit as seen on the recent officially released pictures of the royal family:
The dress was new from Selfportrait, while the coat was worn before by mom Maxima
According to Josine Droogdijk who twitters about royal fashion, the green dress of Maxima in the picture is of (Dutch) fashion designer Jan Taminiau