A Nightdress is a loosely hanging item of nightwear and is commonly worn by women and girls. A nightdress is made from cotton, silk, satin, or nylon. It is that type of clothing which is designed to be worn while sleeping. The style of nightwear worn may vary with the seasons, with warmer styles being worn is colder conditions and vice versa. Some styles or materials are selected to be visually appealing or erotic in addition to their functional purposes.