Julius Schwartz's editorial records, provided to the GCD by DC Comics, credits this cover to Irv Novick. Colors credit from Keith Chandler via the GCD Error Tracker. Corrected the cover art credit to Irv Novick.
Origin of Wonder Girl's costume. After watching her future adventures as Wonder Woman on the Amazon Time and Space Televisor, Wonder Girl wants a costume of her own, but has to win it by performing great feats.