Kate Middleton rocks polka-dot dress to take her children to school

New school, familiar look.

Kate Middleton and Prince William have officially moved from London to Windsor, and yesterday, the royal couple joined Prince George, 9, Princess Charlotte, 7, and Prince Louis, 4, for a “settling in” afternoon at their new school — with Middleton sporting a new version of an old dress for the occasion.

Wearing a brown polka dot dress by Rixo, the duchess, 40, beamed as she held hands with her sons, who wore smart navy uniform shorts with white checked button-down shirts.

If the fit looks familiar, Middleton wore the same “Izzy” dress ($276) in a pink zebra print during this spring’s Caribbean tour, choosing the brown dotted version of the style for yesterday’s school visit.

The button-front shirt dress, which is made from sustainable viscose, features three-quarter sleeves and a drop waist and is also available in a white version with black polka dots.

She kept her accessories simple, pairing the dress with brown suede heels and Kiki McDonough diamond-and-gold hoops ($690) with pearl drops by Annoushka ($480).

The brown outfit was a departure from the usual matching “Cambridge blue” looks the duchess and company usually sport on family outings, but Prince William, 40, did his part to keep the twinning vibes going.

The proud dad coordinated with his kids in a navy blazer and trousers with a light blue button-up, holding hands with Princess Charlotte, who looked adorable in her blue collared uniform dress.

George, Charlotte and Louis attended their first official day at the prestigious Lambrook School in Windsor today following yesterday’s preview event for new students.

While worrying news about the Queen’s health is making headlines today — with family members traveling to Balmoral to be at Her Majesty’s bedside — Middleton stayed behind in Windsor with her children to support them during what is sure to be a time of huge change for the family.