What does "nightclothes" mean?

Clothing worn while sleeping in bed, such as pyjamas or a nightgown, and, when worn over nightclothes, a robe.

What is a synonym for "nightclothes"?

Common synonyms include: nightwear, sleepwear, nightdress, pajama, pajamas.

Pronounced //ˈnaɪt.kləʊ(ð)z//.

/ˈnaɪt.kləʊ(ð)z/ noun

noun ·Rare ·Advanced level

Noun

1
Clothing worn while sleeping in bed, such as pyjamas or a nightgown, and, when worn over nightclothes, a robe. plural, plural-only
"The disturbance brought out many of the neighbors in their nightclothes."
2
garments designed to be worn in bed wordnet

"The disturbance brought out many of the neighbors in their nightclothes."

From night + clothes.