The Playboy Clubs ushered in an era of members-only establishments. The atmosphere was one-of-a-kind and Hugh Hefner succeeded in creating the ultimate club. Scroll through to see the 1960s Bunnies of Playboy Club Chicago.

Hef and the Chicago Club Bunnies: Sheralee Connors, Christa Speck, Joyce Nizzari, Susan Scott, Carrie Radison and Joni Mattis.

Playmate Bunny Joyce Nizzari and Hef at the Chicago Playboy Club; Bunny suit before cuffs and collar were added.

Bunny Bonnie Halpen serving a member a drink.

Hef with Bunnies in Buffet Room Chicago Playboy Club.

Hef and a dozen of the original Playboy Chicago Bunnies in the lobby.

Hef and a dozen of the original Playboy Chicago Bunnies in the lobby.

Chicago Playboy Club Bunny June Wilkinson.

Hef surrounded by Bunnies wearing the new Bunny costume with collar and cuffs.

Bunnies posing with the at the playboy club tonight board.

Playboy Club Bunny Wanda summons the members for the Breakfast Jam Session.