Negligees are a type of nightwear typically worn by women that are loose and flowing in design. However, there are many different synonym options when it comes to describing this type of clothing item. Some synonyms for negligees include nightgowns, nighties, nightdresses, sleep dresses, and night robes. Each of these terms describes a similar type of garment that is worn for sleep or relaxation purposes. Some negligees may include lace or other decorative elements, while others are designed for comfort and ease of wear. Ultimately, the choice of synonym will depend on the specific style and design of the garment in question.