Meghan opted for a light pink off-shoulder dress by Carolina Herrera.
At one point during the ceremony, the entire royal family stands before their public on a grand balcony.
"She was not as prominent perhaps as some people might have expected, but there's a pecking order", Joe Little, managing editor of Majesty magazine, explained to People. But you may have noticed that Meghan was stuck in the back of the royal lineup-behind her sister-in-law Kate Middleton who was pretty much front and center.
Although she did not take the top spot, according to a palace source, the order of appearance on the balcony is not a hard-and-fast rule, but rather, a matter of etiquette and deference.
The Royal family at the Trooping the Colours
McCartney, who created the second wedding dress for Ms Markle, now the Duchess of Sussex, said she was "very proud" to have worked with the bride to tread the "delicate line" of appropriate attire.
As the moment approached, Meghan asked Harry under her breath, 'Do it?' And he replied, 'Yes, ' before she curtsied and he bowed his head.
But here's the kicker: Even though Eliz uses it to travel around the United Kingdom approximately once a month, according to Vanity Fair, it seems she's actually never invited Prince William, Prince Harry or Kate Middleton to step aboard.
"She was still near the heart of the action", Little says.