This morning, the royal family returned to the Church of St. Mary Magdalene on the Queen's Sandringham estate. They were their two days ago for the traditional Christmas service, and today Kate joined William, Harry, and other royals for Sunday Service.

Kate premiered a perfectly tailored skirt suit from Michael Kors collection. The two piece outfit is from the designer's Fall 2015 campaign. It features a Virgin Wool Plaid Blazer with a "vintage-inspired equestrian silhouette" and notched lapels, long sleeves, four-button closure and plaid knit print. The matching skirt is the Guncheck Wool Trumpet Skirt. Kor's describes the plaid colour as ‘slate and claret'. Both pieces have sold out.

Kate wore a black turtle-neck top underneath, and accessorized with her Aquatalia 'Rhumba' boots, Mulberry 'Bayswater' clutch and Sylvia Fletcher 'Fairytale' hat.

The Duke and Duchess of Cambridge celebrated Christmas with the Royal Family at Sandringham and started their day by attending the traditional Christmas service at St.  Mary Magadelene's Church on the estate.

They joined Her Majesty the Queen and other members of the royal family for the traditional walk to the church.

Kate wore a festive green long coat, a new piece from Sportmax by Max Mara.

The belted coat is made from virgin wool and retailed for $1,895 (sold out).

Under the coat, Kate also debuted the Great Plains 'Cézanne' paintbox pleated dress in 'Pine Needle'.

You may recall that Kate also owns this design in 'Winter Pink' which she first wore in 2013.

The Duchess also premiered a new deep green hat, believed to be a Sylvia Fletcher design from Lock & Co hatters.

Today, we saw the return of the oak leaf acorn brooch.

We first got a glimpse of it at the Queen's Jubilee luncheon in 2012

It is reported that the brooch is a gift the Duchess may have been given for her wedding or perhaps from her parents. The brooch is symbolic of the Middleton family's coat of arms featuring three acorns on a oak leaf stem representing the three Middleton children.

Kate finished the outfit with familiar accessories including her Aquatalia 'Rhumba' boots, Mulberry 'Bayswater' clutch and KIKI Classic Green Amethyst Diamond Earrings.

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The Duke and Duchess of Cambridge released a new family portrait this morning, which will serve as the royal couple's Christmas card.

The snap shows Prince William, Duchess Catherine and their two children, Prince George, 2, and Princess Charlotte, 7 months, casually posing in the gardens of Kensington Palace.

The Palace revealed the snap was taken by photographer Chris Jelf in late October, and issued the following statement along with the photo:
 
"The Duke and Duchess are hugely appreciative of all the warm messages they have received about their family this year," the palace said in a press release, adding that the couple "are very much looking forward to their first Christmas as a family of four."

The Duchess was casually dressed in a grey v-neck sweater with blue shirt, skinny jeans, navy plimsolls and her sapphire and diamond earrings.  It's difficult to identify Kate's outfit from this photo.

At best, we can speculate about the brand of shoes she wore.  Her navy sneakers look very similar to her Mint Velvet 'Bibi' taupe plimsolls.

This style was also available in navy blue suede so it's highly likely this is the model she is wearing.

Other possible styles could be these from Jigsaw and Ralph Lauren:

The grey jumper may be the same one she wore to the rugby match while on tour in Australia.

We may never know the exact details of Kate's ensemble, but we can all admire how impeccably polished she looks even when dressed casually! You can steal her style for less with the repliKate options below!

If you would like to know what Prince George & Princess Charlotte wore in the photo, please visit Princess Charlotte Style.

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Today, the Duke of Edinburgh passed his patronage of the Air Cadets to the Duchess of Cambridge.  During an audience at Buckingham Palace, The Duke relinquished his role as Honorary Air Commodore-in-Chief, bringing to an end his 63-year association with the Air Training Corps.
This is Kate's first military linked appointment and she will represent an organisation of 42,000 air cadets aged 12-19 and 15,000 adult volunteers at more than 1,200 units across the UK and abroad.

To welcome her to her new role as Honorary Air Commandant of the Air Cadets, The Duchess was presented with a copy of Horizons: the history of the Air Cadets.

The book sets out the proud history and traditions of the organisation she will represent. You can buy a copy at Amazon.

The audience with the Air Cadets was held immediately after the Queen's pre-Christmas luncheon. Kate remained in the Luisa Spagnoli suit she wore to the festive lunch. Her accessories included the Mappin & Webb Empress Drop Earrings and Stuart Weitzman 'Power' black suede pumps.

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Today, the Duchess of Cambridge gathered with extended Royal family members to celebrate the Queen's annual pre-Christmas lunch at Buckingham Palace.  The luncheon was a private family affair, but photographers managed to get some snaps of the guests as the entered the gates of the Palace.

Kate and Prince George were spotted en route to the Palace with Prince Harry in the front seat of a chauffeur driven Range Rover. Prince William was notably absent from today's festivities. He was in Wiltshire for the memorial service of John Pelly, the father of close friend, Guy Pelly.

Since Kate's first attendance in 2011, she has always favored a festive red outfit for this traditional yuletide luncheon.

Today was no exception.  Kate wore her Luisa Spagnoli red dress suit, accented with black buttons and a black velour bow belt.   In 2014, Kate converted the dress to a skirt to have the hem lengthened.

The 2-piece suit dates back to at least 2011. Kate first wore it when she and Price William visited St Andrews University to mark it's 600th anniversary. We saw it again during the royal tour of New Zealand in 2014.

Today, we also got a glimpse of her Mappin & Webb Empress Drop Earrings.

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