From a Jain dharma perspective, violence (himsa) to any living being is to be avoided. Whether using a feather in a pinchi is considered violent depends on how the feather was obtained.

• If the peacock feather is shed naturally and used without harming the bird, it is not an act of violence.
• If the feather is plucked from a living bird in order to obtain it, that would involve causing pain to the bird and would be considered violence.

Different Jain traditions may have slight variations in practice and symbolic meaning, but the underlying principle remains: minimize harm to all living beings. If you have a specific lineage (Digambara or Śvetāmbara) or a particular text in mind, I can explain how that tradition views the pinchi and its materials more precisely.