PAJAMAS
Etymology
Noun
pajamas pl (plural only)
Clothes for wearing to bed and sleeping in, usually consisting of a loose-fitting shirt and pants/trousers.
Loose-fitting trousers worn by both sexes in various southern Asian countries including India.
Usage notes
Pajamas is chiefly an American spelling; the rest of the English-speaking world uses pyjamas.
Source: Wiktionary
Pa*ja"mas, n. pl. [Hind. pa-jama, paejama, lit., leg closing.]
Definition: Originally, in India, loose drawers or trousers, such as those
worn, tied about the waist, by Mohammedan men and women; by
extension, a similar garment adopted among Europeans, Americans,
etc., for wear in the dressing room and during sleep; also, a suit
consisting of drawers and a loose upper garment for such wear.
Py*ja"mas, or, chiefly U. S., Pa*ja"mas, n. pl.
Definition: A garment, similar to the Oriental pyjama (which see), adopted
among Europeans, Americans, and other Occidentals, for wear in the
dressing room and during sleep; also, a suit of drawers and blouse
for such wear.
Source: Webster’s Unabridged Dictionary 1913 Edition