The dress appeared to be the exact same style to the lemon one she wore to Prince Harry and Meghan Markle's May wedding, which is also identical to the cream one the Duchess wore for Princess Charlotte's Christening in 2015.
As an Honorary Air Commandant of the RAF Air Cadets, the Duchess of Cambridge has added her sparkling Air Cadets Dacre brooch to her lapel.
The royal couple with also meet with young people interested in coding when they visit the startup hub Dogpatch Labs in Dublin 1. Fun fact? Their official titles actually change in Northern Ireland, where locals call them Baron and Baroness Kilkeel.
This evening, Prince Harry will accompany his American bride to a summer party at the British Ambassador's residence, with the guestlist including members of the Irish arts, sporting, military and social enterprise communities.
It comes "at the request of Her Majesty's Government", a spokesperson for Kensington Palace said.
The couple will see the Book of Kells at Trinity College Dublin and will visit the city's Irish Famine memorial.
The trip is largely focused on cementing ties and ensuring that strong relationships between the United Kingdom and Ireland remain in the wake of Brexit. Just hours after attending the Royal Air Force 100th Anniversary celebration this morning, the Duke and Duchess of Sussex hopped on a plane and arrived in Dublin, Ireland, to kick off their first royal engagement overseas post-wedding (before their royal tour of Oceania this fall).
Following the Royal Air Force engagement, she and the Duke of Sussex are heading to Ireland for a two-day royal tour. Do you think it has changed since she became royalty?