means Loose, lightweight clothing — typically a top and trousers — worn for sleeping or lounging.

from From Hindi and Urdu 'pāyjāma,' itself from Persian 'pāy' (leg) plus 'jāma' (garment) — literally 'leg-clothing.' These loose drawstring trousers were everyday wear across South Asia and Persia long before British colonials adopted them as comfortable nightwear and carried the word home in the 19th century, where it eventually came to mean the whole sleep-and-lounge ensemble.