They stated: “There is an absolute feeling that it is not about what the princess is wearing.

“She wants the focus to be on the really important issues, the people and the causes she is spotlighting.”

Although Middleton is aware that many fans enjoy following her fashion choices, she now hopes to redirect their attention elsewhere.

“There will always be an appreciation of what the princess is wearing from some of the public and she gets that. But do we need to be officially always saying what she is wearing? No,” the source explained. “The style is there but it’s about the substance.”

One of the key projects Middleton is backing this year is the launch of the Royal Foundation for Early Childhood, which aims to support people in developing their ‘social and emotional’ skills to promote better mental well-being.

In a statement, Kate said: “Modern society is complex. At times, it can feel like the world is filled with mistrust and misunderstanding, leaving many people feeling isolated and vulnerable during difficult times.”

She added: “If we are to address this properly, if we are to find real, lasting solutions to these deep-rooted challenges and create a physically and mentally healthier society, we must reset, restore, and rebalance. We must invest in humankind.”