It's the first time Meghan has attended the annual event, which began in 1768.
"He said, 'Hello Thomas.' I said, 'Hi Harry.' It became a conversation back and forth, mostly about politics".
The Duchess of Cornwall, Princess Anne, Princess Beatrice and Princess Eugenie were photographed not wearing theirs.
He went on to say that he was "jealous" but "honoured" that Prince Charles was able to walk his daughter down the aisle in his stead.
However, Markle quickly added that he was honoured that Prince Charles stepped in to walk his daughter down the aisle at Windsor Castle's St. George's Chapel and he can't think of a better replacement.
"He said, 'Give Donald Trump a chance.' I sort of disagreed with that".
The Duchess of Sussex made a dazzling debut at the Royal Ascot looking every bit as pretty as Audrey Hepburn from My Fair Lady. That makes Anne a grandmother for the fourth time, and the queen a great-grandmother for the seventh time. At the time she called the situation "deeply personal" and asked for "understanding and respect to be extended" to her dad during the hard time; one would think that after all he put her through, Thomas would've respected her enough to STFU.
He also recalled the one condition he placed on the prince when Harry rang Mr Markle in Mexico to ask permission to marry Meghan.
"I thought he was vulnerable".
Asked about what he thought about Meghan's mother attending the wedding, he said, "My ex-wife is a attractive woman". They'd arrange for me to show up in Los Angeles or in Beverly Hills under different names to get a fitting.
Thomas revealed how Meghan had cried on hearing the news. Markle said he hoped the royal family would "understand my feelings as well".
Kensington Palace said Tuesday that the royal couple will travel to Dublin for two days starting on July 10.