Successfully complete all chapters on the Normal difficulty. Load the cleared 
saved game file, then go to "Gates Of Hell". Enter the "Rodin's Treasure" menu, 
and purchase the "Super Mirror" for 100,000 Halos to get the Umbran Komachi 
(Kimono). The other alternate costumes (listed as "Couture Bullets") will now be 
unlocked for purchase for 100,000 Halos. Note: To change costumes, press R1 at 
the "Chapter Start" screen, then select the "Costume Change" option. The 
following are the available costumes for purchase:

  Couture Bullet (d'Arc) 
  Couture Bullet (Nun) 
  Couture Bullet (Old) 
  Couture Bullet (P.E. Uniform) 
  Couture Bullet (Queen) 
  Couture Bullet (Umbra) 
  Couture Bullet (Various)