Fabric is always ordered in yards (1 yard = 36″) but the width can vary anywhere from 27″ to 123″+. If you choose a smaller width you will need more fabric for drapes. This might result in seams in your finished product (Diagram 2).
If you choose to order fabric and create drapes displayed like diagram 1 you will need more fabric as well as it won’t be as full when completely finished.