The fashion crowd in London is generally known for keeping cool. But on Tuesday, the editors and designers at a ceremony for one of the industry’s most prestigious local awards became palpably excited when Catherine, Princess of Wales, emerged to present this year’s Queen Elizabeth II Award for Design to Patrick McDowell, 29, a Liverpool-born designer.

Dressed in an olive Victoria Beckham suit and a white silk pussy-bow blouse, Catherine walked with Mr. McDowell among mannequins and models wearing the designer’s looks inside 180 the Strand, the Central London building where the event took place. It was the second time the princess had presented the award, which was created by the British Fashion Council and the British royal family in 2018 to recognize the role London’s fashion industry “plays in society and diplomacy.”

The princess did not give public comments at the ceremony, but Mr. McDowell said that their private conversation touched on topics including a shared appreciation for craftsmanship and the designer’s efforts to make collections in Britain and offer customers the option to repair or rework old garments.

Mr. McDowell added that, as Catherine toured the clothes on display, she took interest in a tailored sleeveless jacket called “the Wales jacket.”

“She said, ‘Why would you call it that?’ with a big smile,” Mr. McDowell said. “What a moment, to be sharing jokes with our future queen.”

Patrick McDowell, left, a Liverpool-born designer and the winner of this year’s Queen Elizabeth II Award for Design.Credit…Shaun James Cox/BFC