"Catwalk Countdown," Sundance Channel's new Web-only series is a simple concept: Pick an emerging designer and catch behind-the-scene moments as he or she prepares a collection. "It's about addictive storytelling, but we also hope it is elegant, interesting and fun," Sundance Channel executive vice president Sarah Barnett said.

The first crop of designers to be featured in "Countdown" includes Vena Cava, Christian Cota and Erin Fetherston.

At the series' launch party at the Standard Hotel, Erin Fetherston said that she felt a little wiser with each passing round of shows. "The lessons come in really subtle things," she said. For example, she places white paper on the floor to help show off models' shoes in photographs. "It's more like the insignificant things that make a big difference. You improve your tools for yourself."

Vena Cava's designers said they've learned to not sweat the small stuff. "It's become easier to let little things slide and not be so crazy about small details," Lisa Mayock said, adding that sometimes designers fret over details only they notice.

"Catwalk Countdown" is not Sundance's first behind-the-scenes design show. Last September, Full Frontal Fashion (Sundance's multi-platform fashion brand) premiered "The Day Before," a docu-series by French filmmaker Loic Prigent that followed designers in the 36 hours before their show. On Tuesday, Full Frontal announced a second "The Day Before" season, which producers will begin shooting this week in New York before jetting to shows in London and Paris. Diane von Furstenberg is among the New York designers currently followed by Prigent and his team. The second season of "The Day Before" will premiere in September.