Fabric. Choose a fabric that suits the decor décor and need of your outdoor. Space if you want to block the sun with the, curtains select a, thick-light colored material that prevents light from, penetrating but ensure that the fabric is capable of allowing air to filter. throughou have two options for the style of the curtains: two panels or a single sheet. The two panels allow you to open them in the middle and single curtain sheet must be pulled back from the side. If you opted to use two panels, find the middle of the material to cut it in half.