Binding Mesh with Avastar 2 Problem

[Amphei Jierdon]

Hi Gurus

I ran into a problem when I tried to bind a shirt to a Avastar 2 rig. Before the rigging, the scene looks like this: 

The shirt and the armature are selected... and under it you can see the avatar mesh from which hopefully the weights would be copied...

But when I press the button "Bind to Armature", the avatar mesh "explodes" and the scene looks like this:

I maybe could delete the exploded avatar mesh and append it again from another blend-file, where I still got it, but still I would like to know what I am doing wrong. 

Thanks for help. 

Edited May 15, 2017 by Amphei Jierdon