The costume will be auctioned with other Hollywood items Monday in New York by Bonhams, according to a spokesman for costume owner James Comisar.
The big cat outfit has been authenticated as the one Lahr wore in the 1939 film, according to a Bonhams' sales catalog. It is topped by a sculpted likeness of the late actor.
A secondary costume used in the film was sold at auction in recent years for close to $1 million, the owner's spokesman said.
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