April 28: Empress Masako wore a short brimmed cream silk covered hat for the Midori Prize Ceremony.
May 9: Queen Máxima repeated a blush silk abaca calot headpiece studded with tiny beads on the first day of a visit to Wadden Islands.
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Embed from Getty Images
Designer: Fabienne Delvigne. Claes Iversen suit and Burberry raincoat.
Previously Worn: Jan 31, 2023; Sep 15, 2017; Nov 3, 2016; Oct 25, 2015; Apr 2, 2014
May 10: For the second day of a visit to Wadden Islands, Queen Máxima repeated a headpiece of black silk rosettes studded with gold feathers and a small black birdcage net tulle veil.
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Designer: Laura Noetinger. Zara suit and Natan Coat.
Previously Worn: Oct 8, 2015; April 13, 2011; May 4, 2009
May 11: For the start of the Italian state visit to Norway, Queen Sonja repeated her taupe leather pillbox.
Designer: Fabienne Delvigne.
Previously Worn: May 25, 2022; Sep 6, 2016
Crown Princess Mette-Marit wore a new brimmed hat in pale pink straw braid.
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Embed from Getty Images
Designer: unknown. Natan cape and Valentino dress.
Previously Worn: This hat is new
May 11: Queen Máxima attended the B for Goods Leaders Summit conference in Amsterdam in a repeated pleated red turban.
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Designer: Fabienne Delvigne. Dress by Natan.
Previously Worn: Sep 19, 2021; Oct 16, 2018; March 20, 2015.
May 12: Lady Louise Windsor took part in the Royal Windsor Horse Show in a repeated a dark blue felt fedora with leather hatband and feather trim.
Designer: Hayfield England. Stella McCartney Coat.
Previously Worn: May 14, 2022
Previously Worn by the Duchess of Edinburgh: July 3, 2021
May 14 : Lady Louise Windsor enjoying the Royal Windsor Horse Show in her mum’s camel felt fedora with feather hatband.
Designer: Suffolk Fedora in Camel from Hicks & Brown
Previously Worn by the Duchess of Edinburgh: Dec 22, 2019; Aug 25, 2019; Dec 23, 2018; May 14, 2018
May 15: Princess Akiko in a pale cloche with short brim for the Aoi Festival
May 16: Queen Máxima repeated a warm brown straw picture hat with high upswept slice brim to open the Van Gogh Village Museum in Nuenen.
Designer: Fabienne Delvigne. Claes Iversen dress
Previously Worn: Sep 15, 2021; Jul 7, 2021; Jul 2, 2019; May 25, 2018; Feb 18, 2017; Nov 28, 2016; Nov 1, 2016; Sep 14, 2016; Jun 2, 2016; Apr 21, 2016; Mar 10, 2016
May 16: King Carl Gustaf and Queen Silvia visited Kalmar County as part of King Carl-Gustaf’s Jubilee celebrations. The king wore his Borsalino tan fedora to plant an Öland oak tree in the City Park.
May 17: Princess Anne was in uniform for the Passing Out Parade of First Aid Nursing Yeomanry
May 18: The Duchess of York in a green jeweled headband from The Party Papillon.
May 18: King Carl Gustaf and Queen Silvia opened the “Jubilee exhibition in glass” exhibition at Solliden Castle, the king in his Borsalino tan fedora.
May 18: National Day in Norway saw King Herald and Crown Prince Haakon in top hats, Queen Sonja in a white rounded pillbox and Crown Princess Mette-Marit in her gold Prada headband woven with a pink ribbon.
May 22: Princess Benedikte repeated her navy straw hat with upfolded brim and floral trim for her namesake race at Klampenborg Gallop Track.
May 24: Empress Masako in a sharp navy and white hat for the 50th anniversary memorial service for WWII sailors.
Images from social media as indicated
Royal Hats 
OMG Lady Louise is so beautiful and elegant. A real princess.
The most exciting appearance to me is Mette-Marit in a hat! Since pink is my favorite color I am a fan of this hat. Though, some embellishment would’ve been nice I thought the color paired well with the grey cape! I also like Mary’s bandeau and how nice that it was from a Tasmanian designer.
I love Princess Benedikte’s ensemble. Her hat suits her beautifully.
It’s always good to have a sighting of Princess Benedikte, always elegantly turned out, although I prefer her second ensemble and hat to the first; it may have been a trick of the light, but the colours didn’t gel in the first pictures.
The Japanese hats are always beautifully made, of the finest fabrics, but don’t often stand out because of their similar unobtrusive styling and match to their outfits.
My favourites this time were Louise’s fedoras – I like fedoras and they are co-ordinated well with her outfits, plus I love that she stole them from her mother!