Queen Mary channels Audrey Hepburn in tailored skirt and most enormous hat

Mary wore a navy cropped jacket from Prada with a printed blouse from Proenza Schouler. The chiffon number was teamed with the most gorgeous 1950s-style A-line skirt with a tapered waistline from Baum und Pferdgarten.

The jacquard skirt was teamed with classic accessories to round off her chic look. King Frederik's wife wore the 'Ascent 85 Pink Leather Pumps' from Gianvito Rossi and carried the 'Small Whitney Bag' from Max Mara - two staple pieces from this summer tour.

The star of the show was her enormous navy blue hat which elevated the outfit to the next level. To cater for this, she wore her hair down - styled in bouncy waves.

Later in the day, Mary made a few adjustments to her look to adapt to the stormy weather. She swapped out her designer heels for designer flats - the 'Rope And White Canvas Cap Toe Ballet Flats from Prada, to be exact. She also slipped a Harris Wharf trench coat on for extra warmth and protection from the rain.

During the visit, the royal couple visited Kong Gaurs Gård, a daycare centre, before stopping off at one of Vejle's most successful companies, Welcon A/S, which manufactures steel components and turn-key solutions.

As has been the routine on the summer tour, the royals hosted an evening reception where the queen changed into an elegant dress.

For day four, Mary debuted the 'Claudia Twisted-Neck Floral Midi Dress' from Saloni. The white garment featured a beautiful floral design with long sleeves and a tapered waist. 

The royal wore her loose curls in a side part with a section of hair twisted behind one ear to frame her face effortlessly. 

Crown Princess Victoria of Sweden may have inspired her Danish counterpart as she wore the exact dress when on the Royal Yacht Dannebrog during Mary and Frederik's two-day official state visit to Sweden in May.

Translated into English, the royal pair penned: "Thank you Bornholm and mrø, Assens and Vejle for making our first summer trip one we will never forget.

Everywhere we have been welcomed in the most festive way from roadside, windows and balconies, on harbour fronts, town squares and town halls. 

"Our country has a lot to offer and we have enjoyed experiencing culture and nature, communities and professional skills on our own," they continued. 

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"Thank you to everyone who spontaneously and planned shared personal stories, experiences and talents, and to everyone who prepared, held and participated in the past four days."