Lay the duvet insert evenly on top of the cover. If your insert has corner tabs, tie the cover's corner ties to the tabs and knot securely. Make sure the duvet insert lines up evenly with all the edges and corners of the cover.
How do I keep my duvet from slipping off?
Layer for Security Layer a fitted sheet, flat sheet, thin blanket and comforter or duvet. Add another blanket or a quilt to the foot of the bed to act as an anchor. This allows you to add at least one item in a silky, slippery material without waking up to most of the blankets on the floor.