I washed the nightshirt the day I received it and wore it that night. It's very comfortable and feels good to the skin. I don't know the type of fabric it is it feels silky and soft and is nearly weightless. The fit is good. This is the first article of clothing that has no tag or printing inside to advise me on the materials used to make the item and what the washing instructions are. I'm very pleased with the item and will likely order another one.