The iconic dress that Garland wore as Dorothy in the movie served more purposes than just to make her look young and pretty. The gingham style was specifically selected because, to the camera, it blurred the edges of the garment and made Garland's curves harder to see. It also contained a specially adapted pocket sewn into its seam, allowing the storage of the handkerchief that would later be used on screen to wipe away the cowardly lion's tears.
Undeniably one of the most easily identifiable items of clothing in cinema history, it was always bound to go for a fortune if it was ever sold at a public auction, and it did. In 2012, it fetched a massive $500,000. That's still somehow less than someone paid for the Cowardly Lion's costume a few years before, which just goes to show that there really is no accounting for taste.