Linen, silk, faux silk, and velvet are best choices to use for window treatments since they tend to hang the best, says Guercio. “Faux silk tends to be the most durable,” she says. And in a particularly sunny room, faux silk doesn’t deteriorate as quickly as real silk.
Some fabrics can help keep out the cold. Many hotels use suede, velvet, tapestry, or tweed since their weight helps block light and keep heat in. Still, nearly any fabric can be interlined with bump, a thick, insulating felt material. And interlining—a piece of fabric slipped between the lining and the face fabric—can also help prolong the life of the curtains. “If silk is unlined, it will rot,” says Lawrence. Adds Cunningham: “Lining and interlining are what give curtains their body and fullness.”