What is nightcap garment?

A nightcap garment is a piece of clothing worn on the head when sleeping. It typically covers the entire head and often includes ear flaps. Nightcap garments have been worn for centuries and were popular in the 18th and 19th centuries among both men and women. They were traditionally made from cotton or silk and decorated with lace or embroidery. Nightcaps were believed to help keep the head warm and prevent drafts, thus aiding in a peaceful sleep. However, with modern heating systems in homes, nightcaps are now considered more for fashion or novelty purposes.