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Now you can find out thanks to the Sundance Channel’s new four-part documentary, The Day Before . The series follows designers Jack McCollough and Lazaro Hernandez of Proenza Schouler, Karl Lagerfeld, Sonia Rykiel and Jean Paul Gaultier in the final 36 hours leading up to their Fall 2009 season catwalk shows. Last night, Leighton Meester (in Proenza Schouler) attended the show’s premiere on the arms of the designer duo. We asked Hernandez to tell us the worst thing that has happened the day before a show: “Last spring the roof caved in on our studio. One of the water towers broke. We were wrapping up the clothes when it happened—an all-white collection!” he said. Sounds like must-see TV!

The Day Before premieres tonight at 10PM EST on the Sundance Channel.

Check out Full Frontal Fashion’s newly-launched website and visit InStyle.com daily for more Fashion Week scoop.

A longtime friend of the magazine, OPI was so excited about our 15th anniversary that they created an InStyle Red nail polish to match the rich color we’ve often used on our cover logo and in our layouts. Nothing beats a classic red manicure, so enter to win for a chance to be one of the lucky 1,500 readers to snag a limited-edition bottle.

Melanie Oudin is officially tennis’s newest darling, thanks in part to her to her on-court wardrobe. Oudin, who came into the US Open ranked 70th, beat superstar Maria Sharapova in the upset of the tournament wearing custom-designed pink and yellow Adidas sneakers with the words “Believe” emblazoned on the heel of shoes. Most players opt for their name on the heel, but Oudin’s boyfriend suggested the encouraging word instead. While her “Believe” shoes are not yet available, you can design your own version at adidas.com—underdog status not required.

— Joyann King

Sarah Jessica Parker’s wardrobe for the sequel of Sex and the City is starting to resemble a fashion time machine. First, with Parker spotting wearing a ’90s-inspired ensemble complete with a stomach-baring plaid shirt and Z Cavaricci jeans (remember those?) with teetering Brian Atwood pumps on the set. Then, in a newspaper print Dior by John Galliano dress from his Fall 2000 collection that Carrie wore back in season three of the television series. It seems Patricia Field is not only hitting up vintage stores for the sequel’s wardrobe, but Carrie’s very own closet as well!

Jason Wu tells us his Spring 2010 collection is inspired by Sally, the heroine from The Nightmare Before Christmas. “The bold pink topstitching on this sheath dress adds a pop of color and a Tim Burton-esque touch to the collection,” said Wu. Visit our Designer Central on September 12th for the full collection.

Check back daily until the first day of fashion week (September 11th) for more exclusive sketches.