I want to add wearables on the avatar using the custom shaders

Previously we are using the standard Materials to create the avatar and attach the wearbles to the avatar. Now we want to use the same using the custom shaders. But we do have the same properties like diffuse texture , albedo in the custom shaders. So how we can achieve this or what process to follow in this case.

You may do it with ShaderMaterial - Babylon.js docs

Thanks , I am already using that but still facing issues with ShaderMaterial not picking same properties as the PBR Material / Standard Material

In this case you may try to use PBRCustomMaterial - Babylon.js docs
Or Material Plugins - Babylon.js docs