Britain's Catherine, Duchess of Cambridge
Britain's Catherine, Duchess of Cambridge (C) arrives at an event to mark the 75th anniversary of the RAF Air Cadets, at St Clement Danes church in London, Britain February 7, 2016. REUTERS/Neil Hall

Kate Middleton recycled her pale blue Alexander McQueen coat as she stepped out for her first official engagement as the honorary air commandant of the Royal Air Force Sunday. The British royal, who received the patronage on Dec. 25 from her grandfather-in-law Prince Philip, opted for a black dress. The 34-year-old proudly showed off her RAF brooch pinned to her lapel to celebrate the 75th anniversary of the Air Cadets.

Kate was dressed head-to-toe in various shades of blue. She wore a pale blue custom made Alexander McQueen coat. It featured long sleeves, pointed collar and a belt that was cinched at the waist and showed off her tiny waist. The knee-length coat also featured oversize pockets.

The Duchess of Cambridge paired her look with navy Gianvito Rossi court shoes and a chic black Lock & Co hat. The thrifty Kate wore her Alexander McQueen during a visit to New Zealand where she laid a wreath in the town of Blenheim in memory of the war dead in 2014. She has also been pictured sporting the hat on several occasions.

Her glossy brunette tresses were styled into her favorite blowout. She completed her look with an Air Cadets Dacre brooch. Kate carried a black Mulberry clutch and gloves.

She showed off her diamond and emerald engagement ring and wore matching earrings. The mother-of-two went to the St Clement Danes of RAF in central London where she joined the congregation for a special service to mark the milestone anniversary. She was greeted by Air Commodore Dawn McCafferty and royal enthusiasts as well who had lined up with flags get a glimpse of the Kate.

After the service, she met the cadets and volunteers at a reception at the Royal Courts of Justice, where she was the guest of honor. Kate will now work with a group of 42,000 air cadets aged 12 to 19, as well as 15,000 adult volunteers at more than 1,200 units across the U.K. and abroad.