premise: The book is by Jerome Weidman and George Abbott , music by Jerry Bock , lyrics by Sheldon Harnick , choreography by Peter Gennaro , scenery , <mask> and lighting by William and Jean Eckart , musical direction by Jack Elliott , and the production was directed by Mr. Abbott .
hypothesis: the proper context for <mask> here should be the attire worn in a play or at a fancy dress ball