White Reed Suit parts and how to get it：

Okina Mask——Obtained by killing the NPC Bloody Finger Okina who invaded the Church of Repose.

White Reed Armor——Spiritcaller Cave，Obtained from a corpse in the previous area of ​​the room where the boss is.

White Reed Gauntlets——Spiritcaller Cave，Obtained from a corpse in the previous area of ​​the room where the boss is.

White Reed Greaves ——Spiritcaller Cave，Obtained from a corpse in the previous area of ​​the room where the boss is.