Source : Webster's Revised Unabridged Dictionary (1913)

Pyjama \Py*ja"ma\, n. [Hind. p[=a]e-j[=a]ma, literally, leg
   clothing.]
   In India and Persia, thin loose trowsers or drawers; in
   Europe and America, drawers worn at night, or a kind of
   nightdress with legs. [Written also {paijama}.]

Source : WordNet®

pyjama
     n : a pair of loose trousers tied by a drawstring around the
         waist; worn by men and women in some Asian countries