Despite the more demure, and dare-we say underwhelming outfit choice, Markle will undoubtedly be a stand-out as she joins Prince Harry to make the trophy presentations for the day's fourth race, the St. James Palace Stakes.
But the 73-year-old keeps bungling it, including drawing his new son-in-law into a potential diplomatic controversy by repeating comments he said Prince Harry made to him about Brexit and about wanting to give President Donald Trump "a chance", the Daily Mail reported.
Thomas explained how he apologised to Harry and Meghan after it was discovered that he did a cash deal with the paparazzi to improve his image ahead of the royal wedding.More news: U.S. withdraws from United Nations human rights body
"I've always have a bad attitude about Donald Trump, and that's never going to change", Thomas Markle said.
Thomas said Meghan was smart and Harry was a "good pick".
"She's wanted children for a long time and when she met Harry and she spoke how much she loves him, there's got to be a child in the making, somewhere soon", he said.
He told United Kingdom breakfast TV hosts Piers Morgan and Susanna Reid he "wished" he had been the one to walk Meghan into St George's Chapel, and revealed he cried as he watched Prince Charles step in on May 19.More news: European Union to keep using FYROM name until Athens-Skopje deal is ratified
Thomas described Prince Harry, who he's only ever spoken to over the phone, as a "very nice man, a gentleman, and very likeable".
He joked: "I don't think the stork has hit the air yet but it will happen sooner or later".
Markle, a mild-mannered former lighting director, said: "The unfortunate thing for me now is I'm a footnote in one of the greatest moments in history rather than the dad walking her down the aisle".
"He was very keen in the interview to be very praiseworthy of Harry", he said. "Yeah, he's a prince, but my daughter has been a princess since the day she was born".More news: One Dunkin Donuts asks customers to report workers yelling in foreign language