Facebook founder Mark Zuckerberg wears a hoodie during a keynote address at a 2010 conference in San Francisco. Protesters nationwide are wearing hoodies in support of Trayvon Martin, 17, who was wearing one when he was shot dead while walking in a gated community in Sanford, Florida. Getty Images
Justin Bieber wears a hoodie during a 2010 performance in Atlanta.Getty Images
Actress Lindsay Lohan arrives at Los Angeles International Airport in a hoodie in August 2009.Getty Images
Snoop Dogg performs in a hoodie at New York's Madison Square Garden in November 2004.Getty Images
Boxing legend Muhammad Ali greets the crowd in a hoodie before unveiling a new wallscape for Adidas in Harlem.
Authorities auctioned Unabomber Ted Kaczynski's personal items in May 2011, including his signature hoodie. The proceeds were used to compensate some of his victims.Ashley Hayes/cnn
Sylvester Stallone wears a hoodie in a still from the 1976 film "Rocky."