Could This Be Kate Middleton’s New Favorite Shoe Brand?

Kate Middleton seems to have found a new favorite designer: Rupert Sanderson.

The Duchess of Cambridge wore the designer’s “Malory” navy suede pumps again on Monday — with a graphic Banana Republic skirt — to the Heads Together event. The gathering brought together representatives of the U.K.’s leading mental health charities to encourage people to speak about their mental health issues. Prince William and Prince Harry were also on hand to promote the cause, which all three are fiercely passionate about.

It’s been a busy few days for the young royals. Last night, they attended Queen Elizabeth’s star-studded birthday celebration at Windsor Palace. Prince Harry also just returned from the Invictus Games in Orlando, Fla.

For her part, Middleton has been out and about at many major events during the past few months. She wore the Sanderson “Malory” pumps twice at Kensington Palace recently. And last month, she paired the style with an L.K. Bennett dress for dinner with William, Harry and the Obamas.

In India last month, she wore Sanderson’s “Pink Lady” textured kid-leather Calice pumps, which feature a pointed toe and skinny set-back heel. She paired the style with an off-white Emilia Wickstead dress, and she looked elegant while meeting young Indian entrepreneurs and paying respects to Gandhi at a museum and memorial. Middleton even took the Sanderson shoes off while paying respects, giving photographers — and onlookers — a chance to see the shoes close up.

In March, the duchess chose a different style, Sanderson’s “Winona” pumps with a printed Erdem coat, for a Commonwealth Day ceremony.