Location: Notre Dome. Run up to the altar that opens up and allows you into the basement. Stand in front of the altar, turn your back to the altar, and run forward until you see a red chest.

6. Orange Vest
Effect: Show enemy HP and Critical timing.

Location: Mont-Saint-Michelle. After you complete the puzzle that was opened using the red eye in the head of the beast statue, run down the stairs and through the double doors. In this area kill everything and then hit the boxes. A Oni fly will appear and use it to get to the Orange Vest.

7. Purple Vest
Effect: Less magic power consumed.

Location: Mont-Saint-Michelle. Go into the dark realm as Samanosuke and make it to the very bottom. There is a chest containing the purple vest.

8. Black Vest
Effect: All hits Critical. Each attack reduces your life.

Location: Critical Training. If you complete Samanosuke's criticial training, you get the black vest as a reward.