During the meeting, Kate helped unveil findings of a UK study on the early years of children.
The research was commissioned by the Duke and Duchess of Cambridge to find out what the UK thinks about the early years.
Kate opted for a timeless look in a slim fit white blazer from Zara.
The white ‘waffle’ blazer from Zara was first worn by the royal in 2016 on a tour of Canada.
That may have been the first time fans saw the look but not the last as Kate has recycled it on several occasions.
The smart casual garment had pockets on each side and a sole gold button on the front, which Kate left undone.
While the jacket has not been available to buy from Zara for many years, it can be picked up on eBay for as little as £12.
The Duchess of Cambridge wore the look over a simple black top that was tucked into black tailored trousers.
During the engagement, she wore her thick highlighted locks down and styled into her signature bouncy blow dry.
She wore a pair of the ‘gold small molten hoop earrings’ from Missoma, which are on sale for £48.75, reduced from the original price of £65.
The royal showed off her thrifty side again by wearing the earrings she has been spotted with before.
The timeless pieces of jewellery have an open shape with a butterfly back.
The royal completed her minimal jewellery look by wearing her Welsh gold wedding band on her wedding finger.
The mother-of-three looked youthful with a barely there make-up look.
During the appearance on Tuesday, Kate discussed the findings of the early years research.
The Duchess who has looked into how early childhood experiences cause social challenges since she joined the Royal Family.
Later today, the royal is set to make a keynotes speech to discuss the research.
She is expected to say: “Over the last decade I have met people from all walks of life. I have seen that experiences such as homelessness, addiction, and poor mental health are often grounded in a difficult childhood.
“But I have also seen how positive protective factors in the early years can play a crucial role in shaping our futures.
“The early years are not simply about how we raise our children. They are in fact about how we raise the next generation of adults. They are about the society we will become.”
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Source: EXPRESS CO UK