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July 08, 2015 01:40 PM

Nobody throws it back like Princess Kate.

The royal mom’s affection for classic style and tradition was fully showcased during the Sunday christening of her 2-month-old daughter, Princess Charlotte, from the historic Millson carriage to Prince George‘s outfit, which was an echo of the one worn by his father, Prince William, in 1984.

“It was choreographed like a movie,” Ingrid Seward, author of A Cenutury of Royal Children, tells PEOPLE in this week’s issue. “Because Kate has a photographer’s eye, she likes to paint a picture and likes to recreate.”

The stroller, which Kate pushed to the historic St. Mary Magdalene Church, was previously used in the 1960s by Queen Elizabeth for her younger sons, Princes Andrew and Edward.

(Though its appearance wasn’t just for show: PEOPLE understands that Kate has been using it occasionally, as it is such a “lovely pram,” according to one royal source.)

Princess Charlotte’s Christening Gives a Master Class in Artful Ways to Honor the Royals

“I love the fact that she used the traditional pram that the Queen used for her children,” says Seward. “It’s lovely. If you are part of a traditional family, then it’s very nice to have that heritage.”

As for George’s Rachel Riley outfit – an echo of a similar throwback look at Trooping the Colour in June – it reaffirms Kate’s ongoing theme of deliberately drawing on the past.

(Even nanny Maria Turrion Borrallo got in on the throwback action with her Mary Poppins-style uniform!)

Seward, editor-in-chief of Majesty magazine, adds of Kate, a University of St Andrews art history grad who took Charlotte’s baby portraits herself, “I love what she is doing, setting up little vignettes.”

Says Emma Baxter-Wright, author of Vintage Fashion: “It looked a little like they had traveled back in time.”

For much more from behind the scenes of Princess Charlotte’s christening, pick up this week’s issue of PEOPLE, on newsstands Friday

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