The Wonder City of Oz (1940) is the thirty-fourth of the Oz books created by L. Frank Baum and the first written and illustrated solely by John R. Neill.
Jenny Jump captures a leprechaun named Siko Pompus (apparently a pun on "psychopomp") and forces him to make her into a fairy, but he only does half the job before escaping. Jenny then jumps to Oz using her half-fairy gifts. She soon sets up a fashionable Style Shop with a magic turnstyle which will give anyone high style and challenges Ozma to an Ozlection to become ruler of the Land of Oz.