Original MARY POPPINS Costume Sketch Sells For $50,000 The large sketch measures approximately 14.5'' x 23'', rendered in watercolor, pen and crayon, with swatches of fabric used for the coat.

Watch the "20/20" special edition "The Untold Story of Mary Poppins" airing at 9 p.m. Wednesday, Nov. 27, on ABC, and streaming the next day on Disney+ and Hulu.