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.
For example, if your final measured width is 50 inches, you should purchase enough panels to cover between 75 inches and 150 inches in total width (50 x 1.5 = 75; 50 x 3 = 150.) Valances also should be wide enough to give you the desired degree of fullness.