Silk curtains are incredibly luxurious. Relatively thinner, they tend to let more light through and have an airy, vibrant appearance. You can get lined silk curtains that have a lovely, glossy look to them, but that still offer good light insulation. Silk curtains that are unlined will fade rapidly, but when lined they can be quite hard wearing. They are, however, also quite expensive and they require effort to maintain as silk does not tolerate detergents well.