Known for her frugal approach to fashion, eagle eyed royal fans noted that Kate had also worn the Jimmy Choo high heels before, for her and Prince William's appearance at the BAFTA awards in February.
One day earlier, William and Kate spent the afternoon in Cumbria where they celebrated the "resilience and spirit" or rural British farming communities, and were introduced to first responders, young people trained as mental health first aiders and officers from Cumbria's mountain rescue service.
According to People magazine, the little girl and her sister were waiting for Kate to turn up wearing a Princess Elsa costume and had to be reassured by their father: "It's a princess".
Kate wasn't phased, and had an entirely practical response to what she treated as a very legitimate question.
Kate took it in stride and told the girls that "I came in my pants and my coat because I'm going to see some sheep".
She even sought the girl's approval asking if she thought it was a good idea.
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They added: "It's not unusual to have a few hiccups in a marriage, especially after eight years, and Kate and William are no different".
The couple arrived at Keswick Town Centre to greet the crowds who'd come out to see them, chatting with them about their love of the Lake District and the outdoors.
Kate and Will met the Brown family, who have been farming in the valley near Lake Ullswater since the 1950s. The gala was hosted by Action on Addiction (of which she is Patron) with chef Skye Gyngell and Kate wore a jaw-dropping outfit to attend - consisting of a long white off-the-shoulder jersey midi dress by Barbara Casasola, which she first wore in 2016. United Kingdom about the conversation she had with the royal.
The Duke and Duchess visited the region this week to celebrate the work of local heroes, volunteers and those supporting the rural community in Cumbria.
Charlotte, four, will join her brother Prince George, five, at Thomas's Battersea in September.
"She was very friendly", said Helen Jones, per the Daily Mail.