For years the little black dress - fondly known as the LBD - has been a fashion stand-by.
The dress was immortalized by Audrey Hepburn in the 1961 film Breakfast at Tiffany's. That form-fitting black Givenchy gown sold at Christie's in London in 2006 for 410,000 pounds, the equivalent of about $807,000 at the time.
Years after Holly Golightly wore the little black dress so elegantly, it's still considered a fashion icon, not to mention a go-to for a wide range of occasions.
Boy band One Direction even titled a song on their recent Midnight Memories album "Little Black Dress."
German fashion designer, artist, and photographer Karl Lagerfeld, head designer and creative director for Chanel is often quoted as saying that "One is never overdressed or underdressed with a little black dress."
— Zappos Couture (@ZapposCouture) November 14, 2013
— Weekend (@WeekendSherbs) December 5, 2013
— StyleMint (@StyleMint) November 1, 2013
The little black dress is a top choice at the holidays when women pull it out for seasonal cocktail parties.
— Laura Puddy (@Stylaura) December 2, 2013
— discojunk (@discojunk) December 1, 2013
— Shania Lynn (@ShaniaAlda) December 3, 2013
Retailers capitalize on the dress's fame in marketing campaigns.
— Target Style (@TargetStyle) December 2, 2013
— LuLu*s (@lulusdotcom) November 26, 2013
— Macy's (@Macys) November 22, 2013
— Nordstrom Rack (@nordstrom_rack) October 30, 2013
— Forever 21 (@Forever21) October 26, 2013
Even celebrities turn to the little black dress:
— calypso (@tennesswift) December 5, 2013
— E! Online (@eonline) December 3, 2013
— Fashion_Rules (@Fashion_Rules) November 20, 2013
Rock that bump! Pregnant Gwen Stefani dresses growing belly in little black dress http://t.co/VnGAtVEyHN
— Us Weekly (@usweekly) December 5, 2013
If it was indeed her wedding dress, it will be at least the third time Knightley has worn the Chanel couture blush pink gown. She paired the same dress with black tights and pumps at an event back in 2008.
Coco Chanel herself was known to emphasize the importance of being true to oneself when making fashion decisions.
"In order to be irreplaceable, one must always be different." ~Coco Chanel
— WomenWorking.com (@Womenworking) October 23, 2013
Fashion is not something that exists in dresses only. Fashion has to do with ideas, the way we live, what is happening. -Coco Chanel
— ELLE Magazine (US) (@ELLEmagazine) November 5, 2009
“The most courageous act is still to think for yourself. Aloud.” —Coco Chanel
— Women's Health Mag (@WomensHealthMag) September 23, 2013
Knightley may have been doing just that she when flouted Hollywood tradition and chose a gown she'd previously worn for her wedding dress, then appeared in the same number again a few months later.
Could Knightley and other fashion trend-setters make it acceptable to wear a dress more than once, even if it's not the LBD?