Gaia Clary has a new version of AvaStar out. How binding works has changed. Seems lots of people didn’t get that an item had to be rotated and scaled before attempting to bind the item to the armature. Release Notes So, Gaia has adapted AvaStar to provide more help.
There are 5 new videos out. AvaStar Tutorials Play List. These provide tutorials for fitted mesh.
If you install the alpha version and find problems or want changes, file a ticket.