However, Meghan has continued to do things her own way by opting for a simple and sophisticated black outfit. Prince William formerly served as an RAF search-and-rescue pilot, while Prince Harry received helicopter training from the RAF during his time in the Army Air Corps.
The British royal family gathered at Buckingham Palace in London on Tuesday to watch a flypast celebrating 100 years of the Royal Air Force. Harry was suitably dressed in a suit and also had a green tie.
The neckline, which is incredibly similar to her Givenchy wedding dress neckline, suggests the label is once again behind her look. Meghan wowed in a black cocktail dress which was teamed with a matching clutch and heels.
Meghan Markle must have some serious stamina! I like that she's still given such a classic look a contemporary twist, by wearing the bun to the side, rather than in the middle of her head.
England, Croatia end long wait for semi-final spot
Other fans looked to the future on the heels of Russia's best World Cup performance since the collapse of the Soviet Union. In the quarterfinals match on Saturday night in Sochi, Russia was eliminated from the tournament by Croatia .
It was a quick change for the Royal Couple, who left the Royal Air Force Centenary celebrations, including a reception for RAF personnel thrown by the Queen at Buckingham Palace, and seemingly flew straight to the Emerald Isle.
For 100 years the RAF has defended the skies of Britain, preventing conflicts, delivering aid and combating cyber threats while working in partnership with other services.
Harry and Meghan will "meet the people of Dublin and visit organisations which are central to Irish life".
Later Ireland's Taoiseach Leo Varadkar rolled out the red carpet for the duke and duchess at Dublin's Government Buildings when he officially welcomed the couple to his country.