Fullness is how much a window treatment is gathered on a rod.  As a rule of thumb, 2 to 1 fullness is the most common.  This simply means that to make a window treatment that covers 50″ of window, you would need 100″ of fabric.  At 3 to 1 fullness, you would need 150″ and 1.5 to 1 you would need 75″ of fabric.

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