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But the hoodie uniform reminded her of "teenagers who think Cocktail Dresses being unique but they all look alike," she says. Still, she now has a hoodie with her own company logo, which features a bee. The hoodie's centrality to tech culture was solidified by Facebook founder Mark Zuckerberg, who has made it his uniform. "I never take off the hoodie," Mr. Zuckerberg told participants at the D8: All Things Digital conference last year, while Prom Dresses 2011 in the spotlight. But Mr. Zuckerberg, 27, did take off the hoodie for a February dinner with President Barack Obama. When Mr. Obama came to visit Facebook's headquarters in April, he introduced himself as "the guy who got Mark to wear a jacket and tie." Mr. Zuckerberg ended the session by giving Gorgeous Strapless Beaded Long Prom Dress a hoodie of his own. Cashmere hoodies are all the rage on Sand Hill Road in Menlo Park, Calif., home to many big-name venture-capital firms, according to venture capitalist Marc Andreessen, who recently brought on former U.S. Treasury Secretary Larry Summers as a special adviser. Mr. Andreessen says "the challenge for now is to get Green A-line Strapless Prom Dress to wear a hoodie." At Airbnb, which was founded in 2008 and lets people book vacations in other people's homes, institutionalized fun is a philosophy. "You can't take the day too seriously if you're in a meeting with somebody wearing a fake mustache," says Mr. Gebbia, who often participates in the company's Mustache Monday. He says creating a space where people feel comfortable spurs innovation: "We're going to work hard and play hard."