Meghan also included the poppy, the state flower of her home state of California, in a nod to her American roots in the veil on her wedding day.
The Duchess reflects on this meaningful detail, how she surprised Prince Harry and the royal family, and their adorable reactions.
Clad in what appears to be the same navy Roland Mouret dress that she wore on the eve of her wedding, the 37-year-old gets teary eyed as she sees the gown that changed her entire life - and cemented her love with her Prince Charming.
"Somewhere in here there's a piece of blue fabric that's stitched inside - it was my something blue", Meghan said in the video, released by PEOPLE, as she looked at the veil.
She also speaks about the inclusion in her veil of wild flowers from the Commonwealth.
She added: "It's nice to see it again".
The former Suits actress - who was known as Meghan Markle before she Wednesday the prince in May - had a square of fabric stitched into the stunning 16ft accessory as her "something blue" for good luck on her big day.
The fragment of fabric wasn't visible to the millions watching the wedding on May 19 2018 or even to the friends and family celebrating with the couple at their ceremony at St. George's Chapel, Windsor and then at their reception in the Great Hall of Windsor Castle afterwards.
ITV's landmark documentary explores the Queen's role on the global stage and the baton she is passing to the younger members of the royal family.
The Queen of the World executive producer Nicholas Kent said the documentary will show the world just how hard the Queen still works and how much she dedicates to the Commonwealth. "With the Duke and Duchess of Sussex about to embark on their first Commonwealth Tour to Australia, New Zealand and the Pacific exactly sixty-five years after the Queen's first Commonwealth Tour, this series could not be more timely".
Queen Of The World is screened on ITV at 9.15pm on Tuesday September 25.
Meghan's wedding dress designer Clare Waight Keller first commented on how the idea for the veil came to fruition to People right after the big day.