Rapper Tinie Tempah has been crowned this year's best-dressed man - while the Duke of Cambridge has dropped out of the annual list.
William made his debut at number 27 in GQ magazine's ranking of 50 Best-Dressed Men in 2011.
But he has now slipped out of the list completely, while his brother Prince Harry is 25th - down from fifth place last year - and his father, the Prince of Wales, is 50th.
The magazine said of Harry: "His brother may end up as king, but this year the younger son has been crowned the prince of style" for looking good in "uniforms... well-cut suits (and) the dishevelled tumbling-out-of-a-nightclub jeans".
Charles was said to have made 50th place for "proving the point that some men seem to grow into their wardrobe with age".
The top 10 features Plumstead rapper Tempah, who is credited with possessing a "true passion for elegance and proportions", in first place, followed by mohawk-sporting Manchester City striker Mario Balotelli and Doctor Who star Matt Smith, for being able to look "pretty cool" in clothes that "should be a joke".
Twilight heartthrob Robert Pattinson is fourth, ahead of Spider-Man star Andrew Garfield and Superman's Henry Cavill, for being able to pull off a "superhero outfit and a medieval doublet and hose".
The Wire star Idris Elba, The Dark Knight's Christian Bale, Kasabian guitarist Sergio Pizzorno and Stone Roses frontman Ian Brown, who could wear "a pair of plimsolls as earrings and part of you would wonder if you should, too", complete the top 10.
Take That star and X Factor judge Gary Barlow is a new entry at 16, and X Factor host Dermot O'Leary moves from 40 in 2011 to 18.
Sir Elton John makes 20th on the list, for being "a national treasure" and for "spending enough on fashion to clear the national debt" and Rolling Stones drummer Charlie Watts is placed at 22.
Designer Donatella Versace said: "I have an image of what a British gentleman looks like, and that image finds real expression in Prince Charles. He is beyond fashion - he is an archetype of style."
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The top 50 also includes Colin Firth (31), Professor Brian Cox (33), shadow business secretary Chuka Umunna (34), comic Jack Whitehall (35), Bond actor Daniel Craig (37) and Sherlock Holmes star Benedict Cumberbatch (40).
Irish-German actor Michael Fassbender has been named the most stylish international man.
The worst-dressed list is topped by US rapper Chris Brown, followed by David Cameron's director of strategy Steve Hilton, and Strictly Come Dancing star and football pundit Robbie Savage for looking like "a reject from a Mills & Boon cover".
TV chef Jamie Oliver made ninth place in the worst-dressed list.
Celebrities and fashion experts including Tom Ford, Christopher Bailey, Gary Barlow and David Walliams were among those on the GQ panel who compiled the top 50.
The GQ Best Dressed Men List 2012 appears in the march issue of GQ, out next Thursday.
THE GQ BEST-DRESSED MEN LIST 2012 - TOP 10
1. Tinie Tempah
2. Mario Balotelli
3. Matt Smith
4. Robert Pattinson
5. Andrew Garfield
6. Henry Cavill
7. Idris Elba
8. Christian Bale
9. Sergio Pizzorno
10. Ian Brown
Worst-Dressed
1. Chris Brown
2. Steve Hilton
3. Robbie Savage
4. Dappy (N-Dubz)
5. Mike Jeffries (Abercrombie & Fitch CEO)
6. Country Winston Marshall (Mumford & Sons)
7. Mark Wright (reality TV star)
8. Douglas Alexander (shadow foreign secretary)
9. Jamie Oliver
10. Ollie Locke (reality TV star)
