White on white fabric, most of the on white is plastic stuff
I learned this yesterday from a fabric manufacturer worker. Most white on white fabric has the pattern of the added white 'glued on', it's not in the fabric. This will cause all manner of problems when trying quilt through it. Check the white pattern to see if it is part of the fabric or laying on top of it. Most of all I checked at Joanns and two quilt shops had the pattern applied to the fabric. The white on white fabric that was all fabric was much more expensive.