This is a currency note from the Bank of the United States and is not an obligation of the United States government. The Treasury Department did not issue notes intended for circulation as currency until 1862.
The grommet panel must be a minimum of 70 inches wide, between the side hem seams, to provide just slightly more than 1.5 times fullness on the 40-inch space.
Simply make the side panels as large as they need to be to reach the desired width of your duvet cover, adding 1â to the width of each panel to allow for seam allowance. So, if your center panel needs to be 40â wide and each side panel needs to be 20â wide, cut the panels 41â wide and 21â wide.