We've spent some time discussing what a bad time Jack Haley had in that Tin Man costume. If he complained about it on set, we're willing to bet that Cowardly Lion actor Bert Lahr rolled his eyes and muttered under his breath. Taking into account the wig, the paint and the furry body suit, Lahr's full costume weighed in excess of 100lbs. Bearing in mind what we said earlier about temperatures in the studio, we imagine it contained several more pounds of sweat by the time everything was said and done.
The costume could almost certainly have been made out of lighter materials, but somebody decided it was a great idea to make it out of actual, real-life lion pelts. Presumably they felt it added that touch of authenticity? The costume later went on to sell for $826,000 at auction in 2006.