: Do you need a step-by-step on how to put this on your avatar in Unity?

The file likely contains the 300JPY_013 3D asset designed for the VRChat avatar Selestia (セレスティア) , based on listings from the digital marketplace BOOTH .

Since I cannot open or read the specific zip file from your device, I can help you create content about the product or provide instructions on how to use it if it is indeed the 3D clothing asset. Common Contents for VRChat Asset Files

: A text file with the creator's Terms of Service and basic installation instructions.

Typically, a zip file with this naming convention from BOOTH contains: