To avoid an unattractive center seam the center panel of the duvet cover or comforter should use approximately one entire width of 44/45″ (115cm) or 54″ (140cm) fabric. For Twin and Double/Queen sizes the remaining fabric length is split into two equal width side panels. For King size each panel uses an entire width of fabric.
As a guide, a Piecing Diagram is included for our four standard sizes mattresses. The diagrams include the suggested length and width measurements for each panel.