The stunningly simple yet impactful piece features, you guessed it, a bateau neckline and thin waist belt - two components Markle has donned on numerous occasions, such as her attractive olive green Ralph Lauren number she wore the day before to Prince Louis' christening. (The Duchess of Cambridge is now on maternity leave, but stepped out for the RAF's celebration regardless).
The Duke and Duchess of Sussex landed in Dublin on Tuesday to kick-start their two-day tour of Dublin, and to ensure that their visit goes as smooth as possible, they have - just like the Duke and Duchess of Cambridge - an entourage team on board, and their are eleven members.
Meghan looked sensational in a simple black dress with a matching fascinator as she clung to her husband's arm. Even Prince William and Kate Middleton are attending, after making an appearance for their son Prince Louis's christening yesterday.
During the event, one hundred RAF aircraft will fly across England to celebrate the Royal Air Force's 100th anniversary. Following the service at Westminster, a royal flypast took place over Buckingham Palace.
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Meghan stunned in a dark green top and skirt, which are believed to be by Givenchy, who designed her wedding gown.
This marks a busy week for Markle, who officially became part of the royal family when she married Prince Harry in May. The occasion is particularly close to the family's heart, as Prince William was presented with his RAF wings by his father, Prince Charles, in 2008.
The couple will see the Book of Kells at Trinity College Dublin and will visit the city's starvation memorial.