The two-part documentary series, set to air in the United Kingdom on September 25, "offers a unique insight into Her Majesty The Queen's role as a figure on the global stage and the baton she is passing to the younger members of the Royal Family as they continue to build the Commonwealth connection", according to ITV.
In the clip, Markle smiles as she sees her dress and veil before remarking on the veil's embroidery, which features the flora of the 53 countries of the commonwealth embroidered onto it.
Touching her veil, Meghan said: "53 countries, oh my goodness".
After gasping in astonishment, Meghan Markle couldn't believe her eyes when she saw her wedding gown for the first time. Harry asked, before reassuring them: "If you suddenly bump into her in the corridor, don't panic".
Meghan is joining Harry as a Commonwealth Youth Ambassador as part of her royal duties. "It will keep us busy", she said.
We don't know about you, but we're totally here for Meghan's British accent.
Just weeks after her visit, Markle will head to the Oceania region with Prince Harry, as the two are set to tour Australia, New Zealand, Fiji and Tonga.
In a candid documentary offering a behind-the-scenes insight into Royal Family life, the newly-wed Duke of Sussex tells visitors he gets nervous when he spots her approaching.
Royal admirers caught a glimpse of the special moment on Monday when ITV released a trailer for its new documentary, Queen of the World.
Sally, who made the Celebrity Big Brother final but lost to Coronation Street star Ryan Thomas, who was crowned victor on September 10th, also predicted a "restructure within the royal family" next year, a change she described as "a biggie".