Prince Louis sported trousers rather than smart shorts at the Princess of Wales's Christmas carol service last week.

The six-year-old appeared to break the major tradition that has been upheld for young royal boys for many years.

Donning a smart black suit with a red tie, Louis sweetly matched his attire with his older brother Prince George, 11, and their dad Prince William.

As reported by HELLO!, male members of the British Royal Family typically tend to wear suits from the age of seven. A few months shy of his birthday, Louis will turn seven next April.

George was seven when he first appeared in a navy suit and striped tie while watching the Euro 2020 final in London.

During public appearances over the past few years, Louis has often sported shorts with knitted jumpers.

Much like Louis, Prince William and Prince Harry wore shorts in public until their seventh birthdays.

British etiquette coach William Hanson spoke to HELLO! in 2018. He explained: "Today, young boys usually transition into trousers around age seven.

"Prince George is always seen in shorts because upper class and upper middle-class parents believe that little boys should look like little boys, and so try to keep their offspring looking as cute and innocent for as long as possible."

He finished by adding: "It's one of the many silent class indicators we have in Britain. Trousers on young boys is considered a tad suburban and lower market."

Coordinating with her two brothers, nine-year-old Princess Charlotte wore a smart burgundy coat with black tights.

Tying her look to match her mum Princess Kate, Charlotte wore a bow in her hair - much like the one on Kate's long red coat.