two-sided fabric
A piece of fabric (e.g. a skirt, cape or cloak) with different colors or patterns on each side (c.f. colored inner hair).
For instance, this might be a garment with a separate liner of a different fabric, or a single piece of fabric that looks different on the front and back. This could also be a reversible garment designed to be worn inside-out with a different color or design (e.g. a jacket).