Complete the indicated task to unlock the corresponding costume.

Ayane's Dynasty Warriors (Son Shokou) costume: Complete 20 Team Missions.
Ayane's Sigma 1 (hooded) costume: Complete the game under the Acolyte or Warrior difficulty.
Momiji's Dragon Sword (training) costume: Complete the game under the Acolyte or Warrior difficulty.
Momiji's Dynasty Warriors (Sanzo Houshi) costume: Earn the "Master Ninja" rank on 30 Chapter Challenges.
Rachel's Assassin Rachel (short hair) costume: Complete the game under the Acolyte or Warrior difficulty.
Rachel's Cutie Rachel (long hair) costume: Complete the game under the Acolyte or Warrior difficulty.
Rachel's Dynasty Warriors (chosen) costume: Complete the game under the Mentor difficulty.
Rachel's Sweet Rachel (curly hair) costume: Complete the game under the Acolyte or Warrior difficulty.
Ryu's Classic Hayabusa (Ryuken) costume: Complete 10 Team Missions.
Ryu's Devil Hayabusa (Fiend) costume: Complete the game under the Acolyte or Warrior difficulty.
Ryu's Dragon Clone Hayabusa (Ninja Gaiden Sigma) costume: Earn the "Master Ninja" rank on 10 Chapter Challenges.
Ryu's Dynasty Warriors Hayabusa (Choun Shiryu) costume: Complete the game under the Mentor difficulty.