If you move the down evenly and just sow you it into blocks, it will stop your down from shifting, but your duvet will get cold spots on the seams. The way goose down works is by trapping air as it lofts, and the stitching will prevent it from lofting. Unfortunately the best way is more complicated and messy, you need to make a boxed baffle construction where you sow a 4cm strip of fabric to both sides of the down proof fabric to create blocks. Please visit our site or email me if you have other questions.
formatting link