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Noun: pj's  'pee,jeyz
Usage: informal
  1. (usually plural) loose-fitting nightclothes worn for sleeping or lounging; have a jacket top and trousers
    "He changed into his comfortable pj's before settling in for a movie night";
    - pajama, pyjama, jammies [N. Amer, informal], jim-jams [Brit, informal]

Type of: nightclothes, nightwear, sleepwear