This day in geek history: September 2

1950

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Early costume worn in 1950 by Bob Johnson.

First known reference to a masquerade (costume competition): Stacey Lee Feldmann, a cosplay historian, has tracked down the term and the associated competition structure to the 1950 WorldCon, called NorWestCon.

http://www.strangelandcostumes.com/history.html

http://www.fanac.org/worldcon/