How to use shader making plane have thickness?

Hello everyone !
I am working with some cloth in unity and try to make it real.
So i need to simulate the thickness not just a plane.
Because of the physical collision, i can't just make thickness in blender.
Is it possible using shader to display the thickness?

 

Try obi in the asset store

 

I am using Obi now. I know that Obi have proxy tool.
But due to the complex mesh structure, it not easy to assign the inside and outside part due. So i think maybe using shader is an another way to to this.

 

It would if shader had concept of edges, but they only know vertex and triangle, so the only option is to extrude.