You could make your window scarf reach down to the bottom of the window only, all the way to the floor for a more dramatic effect, or somewhere in between.
If the window is 60 in (150 cm) wide, then your 2nd measurement will be 120 in (300 cm).
For example, if you want the window scarf to hang down 30 in (76 cm) on each side, and the window is 60 in (150 cm) wide, then you should buy 180 in (460 cm) of fabric. 22 in (56 cm) is a good width for a curtain scarf, but it is completely up to you and the look you are going for.
Try folding your fabric in half before you drape it and mark the middle with a clothespin to make it easier to find the center of the curtain scarf when you hang it. You can pin the curtain scarf together in the corners where the front part overlaps with the sides hanging down behind the curtain rod to secure the window scarf in place.
You can pin the window scarf together on the parts in the middle where it overlaps to keep the shape you created in place.
Installing the hooks 3 in (7. 6 cm) past the corners of the window frame will allow the scarf to drape down over the sides of the window.
You could install more than 1 hook above the middle of the window frame if you want to create more drapes in the window scarf. It is completely up to you and the style you want to end up with.
It is totally up to you and the effect you want to create to determine how long you want the ends of the curtain scarf to be.
If the window is 60 in (150 cm) wide, then double that to get 120 in (300 cm) for your 2nd measurement.
If you want the window scarf to reach down 30 in (76 cm) from the top of the window on each side, and the window is 60 in (150 cm) from corner hook to corner hook, then get a window scarf that is 180 in (460 cm) long. Use fabric that is at least 22 in (56 cm) for a curtain scarf to create wide enough drapes.
If you have more than 1 hook in the middle, always start with hanging the center of the fabric over the center hook first so that each side is even. You can knot the window scarf around the corner hooks to secure it in place.
Play with different fabrics to get the look you want. Try a delicate fabric of a lighter color in the back, and a heavier, darker fabric for the front scarf.
Drape the window scarf with the tied parts hanging down so they stand out.
For example, you could use gold ropes to tie a dark blue or purple window scarf, or layer a floral-patterned scarf behind a solid white scarf.