British royalty has made its mark on Vanity Fair's International Best Dressed List, with the Duchess of Cambridge and her brother-in-law, Prince Harry, both making this year's stylish slate.

Australian-born Princess Mary of Denmark, wife of Crown Prince Frederik, was also named one of the world's best-dressed.

The Duchess of Cambridge, who earned top spot on the 73-year-old list, has no dresser.

She has earned applause for the way she mixes high-end couturiers such as Alexander McQueen with her own selections from the racks of TopShop and other chains.

It's the third time the former Kate Middleton has appeared on the list, and this year she appears on one of the magazine's two September covers.

Actress Jessica Chastain, who features on the list for the first time, graces the other cover.

Prince Harry also makes his debut on the list this year. Prince William failed to make the cut.

According to Vanity Fair, Crown Princess Mary's favourite labels are Hermes, Prada, Burberry and Chanel.

Princess Mary reportedly wowed the United States with her style when she and Prince Frederik visited Washington DC earlier this year, even though Mary dealt with a wardrobe malfunction - her shoe fell off while walking through Arlington National Cemetery.

Celebrities on the list included rapper Jay-Z, Alicia Keys and actors Diane Kruger and Richard E Grant.

Swiss financier Arpad Busson, former partner of Australian supermodel Elle Macpherson and the father of her two sons, is on the list for the second year in a row.

Actor Colin Firth and his wife Livia featured in the Best-Dressed Couples category, along with US President Barack Obama and his wife Michelle.

Vanity Fair inherited the list, considered one of the most influential in the fashion world, from the late fashion publicist Eleanor Lambert in 2004.

- AAP

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