Pajamas, also spelled pyjamas can refer to several related types of clothing. The original paijama are loose, lightweight trousers fitted with drawstring waistbands and worn in South and West Asia by both sexes. In many English-speaking nations, pajamas are loose-fitting, two-piece garments derived from the original garment and worn chiefly for sleeping, but sometimes also for lounging, also by both sexes. More generally, pajamas may refer to several garments, for both daywear and nightwear, derived from traditional pajamas and involving variations of style and material.
The word "pyjama" is a variant of "pajama" (पजामा/پاجامہ) which was incorporated into the English language during British Raj from Hindustani (the progenitor language of modern-day Urdu and Hindi). This word originally derives from the Persian word پايجامه Peyjama meaning "foot garment".