When it comes to fashion, elegance and grace, Britain's royal favorite and Duchess of Cambridge Kate Middleton never fails to impress her admirers.

At the recent 'Order of the Garter' service at Windsor Castle on Monday, the 29-year old looked stunning in a mid-sized Philip Treacy headpiece perched in a slating manner on her open hair along with natural make-up; a look often referred to as the Duchess' signature style.

Her light blue-grey dress was complimented with a matching coat, giving her a regal and elegant look.

Over 6,000 people were present to watch the pageantry of the Order of the Garter service. Founded in 1348, the Order of the Garter is the most senior and the oldest British Order of Chivalry. The Order, consisting of the King and twenty-five knights, honors those who have held public office, who have contributed in a particular way to national life or who have served the Sovereign personally.

At the service, every knight is required to display a banner of his arms in the Chapel, together with a helmet, crest and sword and an enamelled stallplate. Upon his death, these are returned back to the Sovereign.

Check out the pictures of the 'Order of the Garter' service and Duchess' signature style below: