Page "Ruby slippers" Paragraph 10
Another pair, the close-up or insert shoes, is in best shape of all, appears to be better made, and has no orange felt on the soles, with "# 7 Judy Garland " written in the lining.
According to the Library of Congress, " it is widely believed that they were used primarily for close-ups and possibly the climactic scene where Dorothy taps her heels together.
" Circular scuff marks on the soles support the theory that they the ones Garland had on when she clicked her heels together.
The lack of felt indicates these were likely also the shoes taken from the feet of the dead Wicked Witch of the East ( since the soles are visible in the film ), hence their nickname: the " Witch's slippers ".