After a year of loungewear and dressing from the waist up, these tailored but informal trousers have won over everyone from Kendall Jenner to the Duchess of Cambridge

Scrolling through the Instagram page of model and Kardashian scion Kendall Jenner, one photo, posted on 28 April, stands out. In this one, she’s not on a Vogue cover or the deck of a yacht, but crossing a New York street. And instead of a bikini or cycling shorts and a crop top, she’s wearing a pair of tailored beige trousers, cinched with a black leather belt, pleated and full in the hip, loose of leg, teamed with a white T and an oversized shirt. It’s one part Diane Keaton in Annie Hall, one part Katharine Hepburn in The Philadelphia Story, one part Kennedy weekending at Martha’s Vineyard.

Two weeks later, Danielle Haim wore an identical pair of pale, full, elegantly tailored trousers on the red carpet at the Brits, just a few days after model and entrepreneur Rosie Huntington-Whiteley posed on her Instagram in the same. (Fashion sleuths point to the Igor Pant by The Row, for sale at a cool £860, as being the originator of this trend.) In the last week of May, Jennifer Lawrence was photographed in New York wearing creamy front-pleat trousers with a cropped white T-shirt on the same day that the Duchess of Cambridge, more usually a dress-wearer, wore a slightly darker pair to attend the opening of a new hospital in Kirkwall, Scotland. International travel might be virtually grounded, but there is no stopping the global spread of this look.