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.
- It's an old tradition that a bride should have something old, something new, something borrowed and something blue on her wedding day, and the Duchess of Sussex followed at least part of that when she married Prince Harry.
"Somewhere in here, there's a piece". That famous veil was trimmed with representations of the flowers of all the Commonwealth countries, with the organisation a major focus of Harry and Meghan's future work together.
The Duchess of Sussex sewed a piece of the garment into her wedding dress for the big day.
The new royal documentary takes a closer look at the royal family and the Queen's record-breaking 66 years on the throne, showing intimate moments behind the scenes and exclusive chats with the highest-ranking members of the family.
"The Queen is the most well-travelled monarch in history and it's been fascinating to see how she has passed on her experience to the younger generations of the royal family".
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The 16.5-foot silk tulle veil was hand-embroidered in silk and organza and famously featured flora representing the countries of the Commonwealth.
"I'm really over the moon to find out that I would make this choice for our day together", Meghan said in another clip released by HBO. "It's my something blue", Meghan revealed while gently inspecting the bridal ensemble.
Meghan and Harry will begin their first major Commonwealth tour in October travelling to Australia, New Zealand, Tonga and Fiji.
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.
She says: "We had two or three meetings talking about sketches and different ideas of how this could really come to life".
Queen Of The World is screened on ITV at 9.15pm on Tuesday September 25.