Prince Louis charmed the crowds gathered along the road to St. Mary Magdalen Church in Sandringham on Sunday. Even those who were not able to see the Royal Family take their traditional walk on Christmas Day in person were enthralled by the little guy (*raises hand*).

But why is Louis wearing shorts on a cold winter morning in December?

While the surrounding family members were dressed in coats (yes, Louis was wearing a dress coat - his coat was blue), Louis was wearing burgundy shorts, which, according to People magazine, is "an age-old tradition of the young English prince."

"Boys wear short pants until they are eight years old," says Ingrid Sward, a royal expert and editor-in-chief of Majesty magazine. 'It's very British.'

On Sunday walks and church services, Louis makes his debut at a traditional royal function! Wearing a navy dress coat over a plaid shirt, burgundy shorts, knee-high navy socks, and slip-on loafers, People reports that Louis' mother, the Princess of Wales, about the mild weather that day, told people close to her that the weather was "mild.

"It's still considered very suburban for a little boy to be wearing long pants," Sward said, adding that graduating from long pants is an exciting milestone: "Until you're eight, you're in shorts, and you're like, 'Wow, long pants."

Louis' father Prince William and uncle Prince Harry used to wear shorts when they were little, as did Louis' brother Prince George. Nevertheless, rules (or in this case, temperatures) change; when George made his debut at the Christmas Walk at Sandringham in 2019 at the age of 6, he wore pants, "proving that shorts are just a suggestion," People reported.