The Duchess of Cambridge, 40, was described as “resplendent” as she came out at the very top of the rankings. Her style was painted as “sovereign superstar”, and “perfectly tailored”.
She matched up to the description a “modern duchess”, and the magazine added: “Everything should be perfectly tailored, embracing current catwalk trends through a lens of appropriate dress lengths and classic silhouettes.
“Oh, and plenty of Alessandra Rich.”
The Duchess of Cambridge has been spotted several times donning the Italian-born designer, most recently during her Wimbledon appearance last month.
She donned a navy polka dot number to present defending champion, Novak Djokovic, his winning trophy.
She was joined by Prince William and Prince George, eight, in the Royal Box at Centre Court.
The Duchess previously rewore a blue polka dot Alessandra Rich number with three-quarter sleeves to watch an earlier Wimbledon showdown.
But Tatler Magazine chose to put the spotlight on a white-and-black polka dot dress the Duchess wore to Royal Ascot earlier this year.
The dress, paired with a complementary hat, was widely thought to have channelled the outfit worn by the late Princess of Wales decades earlier.
Hot on the Duchess’ heels was businesswoman Vimbai Masiyiwa, who was lauded for her “all-out glamour”.
The Zimbabwean entrepreneur was praised as having both “beauty” and “brains” by the magazine.