If you are already in work clothes, put your PJs or nightie over the top of them.
From the post-gazette.com
The oldest breaks into a neighbor women's boudoir and steals a diaphanous nightie.
From the bostonherald.com
There are so many I have to use the front of my nightie to carry them inside.
From the guardian.co.uk
They wear a few feathers and G-string spangles as nonchalantly as a flannel nightie.
From the smh.com.au
In the event of an emergency, I'm not sure what I could do with my nightie.
From the eadt.co.uk
After an outcry, she agreed to wear a nightie during matinee performances.
From the theargus.co.uk
Not forgetting the sight of Stephanie Beacham taking a bath in her nightie and sunglasses.
From the borehamwoodtimes.co.uk
The curtain rises on Marguerite, lying on a chaise longue in her nightie, and dreaming.
From the time.com
But she was on her bed in a little white coffin with her wee nightie on.
From the metro.co.uk
More examples
Nightgown: lingerie consisting of a loose dress designed to be worn in bed by women
A nightgown (also called a nightdress) is a loosely hanging item of nightwear. Nowadays the term is almost exclusively applied to women's nightwear. A nightgown is typically made from cotton, silk, satin, or nylon. It may be decorated with lace appliques or embroidery at the bust and hem.
A woman's nightgown or nightdress; a dress-like garment worn to bed
A short nightgown, it is a sweet little number for slumber, often made of cotton or other light material.