Nightdress (noun)

A garment worn by a woman while sleeping.

Origin:

From the word "night" and "dress" meaning "a garment worn to bed".

Examples:

1. She put on her nightdress before going to bed.
2. The nightdress was made of cotton.
3. The nightdress was long and flowing.
4. She had several nightdresses in different colors.
5. The nightdress was comfortable and helped her sleep.