A shirt Leonardo DiCaprio wore in “Titanic” and Michael Keaton’s Batman suit each fetched thousands of dollars at a Hollywood memorabilia auction, but neither came close to the price garnered by the Cowardly Lion costume worn by Bert Lahr in “The Wizard of Oz,” which sold for $250,000. Leo’s shirt brought $10,000 at the auction Saturday. The Batman suit went for $60,000. The Cowardly Lion costume included the original body of lion pelts plus a remade headpiece, an event publicist said. Another “Oz” item, the Wicked Witch’s hat used in the scene where she exclaims “I’m melting!,” sold for $50,000.