noun.
A woman's nightgown or nightdress; a dress-like garment worn to bed.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
lingerie consisting of a loose dress designed to be worn in bed by women
Word Usage
""I love you - G xxx" so of course I got all mushy and soft and even hugged it (I know I'm pathetic) then decided to put on my nightie for bed and there under my pillow wrapped in my nightie was another note that said:"