Royal blue Kate looks stylish and elegant in an Alexander McQueen coat as the royals walk to the Sandringham church service on Christmas Day

The Princess of Wales looked suitably regal in a rich royal blue as she celebrated Christmas Day at Sandringham with the extended Windsor family yesterday.

Holding daughter Charlotte's hand during the walk to the annual Christmas Day service at St. Mary Magdalene Church, Kate's centerpiece was a long Alexander McQueen coat with fabulously structured shoulders and a cinched waist. Simple, stylish, elegant… We expect nothing less.

She paired this with a navy turtleneck jumper, custom 'Glen 85' suede knee-high boots from Gianvito Rossi worth £1,180 and a custom matching royal blue headpiece. The dramatic pillbox-style felt hat, designed by London-based milliner Juliette Botterill, was adorned with an elegant, stylized bow and crossed feather embellishment.

The look was completed with her paired sapphire drop and diamond earrings from the jewelry collection of her late mother-in-law, Princess Diana.

It was the queen of tonal dressing at her best.

In step: King and Queen Camilla. Below: Sophie, Duchess of Edinburgh in feathered fedora

Kate, who has been known to wear the same clothes in different colours, also owns a green version of this beautiful Alexander McQueen coat and a black version of the hat, which she wore to the St David's Day Parade in March this year the Welsh Guard.

Kate has adhered to the formal Christmas dress code since she first joined the family at Sandringham in 2011, the same year she married Prince William at Westminster Abbey. On that first occasion, she wore a maroon coat dress and matching hat by Jane Corbett.

In the twelve years since, this formula of a tailored jacket with a matching headpiece has been refined and iterated and this is perhaps the strongest version yet.

Her family coordinated their outfits this year. The future king and his eldest son, ten-year-old George, were also dressed in blue, while eight-year-old Princess Charlotte wore a fern green double-breasted coat with a velvet collar – similar to the color her mother wore last year. – with navy blue tights and matching flats.

Meanwhile, little Prince Louis, five, tied the family together with the most festive outfit of all: a navy pea coat over green and blue tartan trousers, £60 from Trotters – a change from his usual shorts and knee socks.

He admirably grabbed the hand of his older cousin Mia Tindall, nine, also on her way to the service with her parents, Zara and Mike Tindall, and sister Lena, five.

The Duke and Duchess of Edinburgh attend Christmas Day morning church service at St Mary Magdalene Church in Sandringham, Norfolk

The Prince and Princess of Wales weren't the only ones coordinating. The King and Queen wore complementary colours, with Camilla wearing a beige long Anna Valentine coat that we've seen before. She wore a blue silk paisley dress, accessorized with beige boots and a Philip Treacy hat with feather detail. The king mirrored her with a classic camel coat.

The always elegant Sophie, Duchess of Edinburgh, was seen in a coat dress by Claire Mischevani, a British designer who has become a firm favorite among the royals.

Sophie's tweed piece is an adaptation of a khaki crepe design – also with a tie-detail neckline – available online for £1,145. A fantastically festive choice, topped off with a £95 Hicks & Brown fedora.

For the second year in a row, Andrew, the disgraced Duke of York, walked to church with the family. His ex-wife, Sarah, Duchess of York, joined him in public at Sandringham for the first time in years. She walked alongside her ex-husband in Holland Cooper's Dowdeswell coat, £799, in emerald green, a traditional choice for the Sandringham tableware, paired with ankle boots and a matching jeweled clutch.