In version 1.02, many players were just starting out and looking for the "proper" tools to beat early bosses like the Chained Ogre:
Sold by Pot Noble Kormori at Fountainhead Palace for 12 Treasure Carp Scales. sekiro-shadows-die-twice-v1-02
If you are looking for a "piece" to complete a larger set, it's likely one of the three fragments of the Dancing Dragon Mask : In version 1