Sources noted where I could find them.
Tracy Ho and Demir Oral dressed in cosplay at Comic-Con 2011 preview night on July 20, 2011 in San Diego, California. (Photo by Jerod Harris/Getty Images)
Women dressed as “USO girls,” arrive to promote Paramount Pictures and Marvel’s “Captain America: The First Avenger,” before a showing of the movie during Comic Con Thursday, July 21, 2011, in San Diego. (AP Photo/Gregory Bull)
Stephanie Horner, left, and Nick Frederickson, dressed as characters Harley Quinn and The Joker, pose during the first day of Comic Con Thursday, July 21, 2011, in San Diego. (AP Photo/Gregory Bull)
SAN DIEGO, CA – JULY 21: Cassandra Poulin of Los Angeles attend Day 1 of Comic-Con 2011 on July 21, 2011 in San Diego, California. (Photo by Frazer Harrison/Getty Images)
SAN DIEGO, CA – JULY 21: Ashton Larson poses during Day 1 of Comic-Con 2011 on July 21, 2011 in San Diego, California. (Photo by Frazer Harrison/Getty Images)
COMMERCIAL IMAGE – In this photograph taken by AP Images for PEI, guests in costume are seen at the LMT Music Lodge during Comic Con 2011 on Thursday July 21, 2011in San Diego. (Katy Winn/AP Images for PEI Entertainment)
Crysstal Hubbard, left, and Katherine Babayaco, friends from high school in San Ramona, CA, are dresses as femme fatale from Batman, Hubbard as a female version of The Joker and Babayaco as Catwoman (By John Gastaldo).