100% viscose. A very tough version of crepe viscose which can be dyed to any colour and can withstand a hot temperature in the washing machine. The fabric will crinkle up when you wash it, but just steam iron it back into shape. If you’ve lost weight recently, don’t iron it so much, and if you’ve put on a few pounds (!) add a bit more steam to your iron and make the fabric grow. It’s your best friend in your wardrobe.