negligée

Century Dictionary and Cyclopedia

1. n. Easy and unceremonious dress in general: as, she appeared in negligée.
2. n. A form of loose gown worn by women in the eighteenth century.
3. n. See negligée necklace, below.
4. Carelessly arranged or attired; unceremoniously dressed; careless.

Wiktionary

1. n. obsolete A light women's gown.
2. n. A loose women's dressing-gown, especially when lacy or revealing; a nightgown.