The outfit was worn by actor Bert Lahr in the 1939 movie, in which he starred alongside Judy Garland as Dorothy,, reported Independent.
It is expected to be a big draw at the Bonhams New York sale after a secondary lion costume from the film previously sold in recent years for almost USD 1 million.
The unique lot also features a sculpted likeness of the late Lahr, according to a spokesman for owner James Comisar.