Pyjamas or pajamas (American English), often shortened to PJs, jimmies, jimjams or jammies, can refer to several related types of clothing. 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 was incorporated into the English language via the British Empire from c. 1800 through the Bengali pajāmā, itself from the Persian word pāy-jāmeh (پايجامه lit. "leg-garment"). The original pyjāmā are loose, lightweight trousers fitted with drawstring waistbands worn by Muslims in India and adopted by Europeans there.

https://en.wikipedia.org/wiki/Pajamas

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