Pyjamas: loose fitting bed clothing.
Pyjamas have their origins in British colonialism, this is a word the English took from other languages rather than the other way around (as is usually the case).
The word is originally Persian, and comes from the word ‘paejamah’, which meant ‘loose fitting leg clothing’ those lucky Persians wore pyjamas as a usual type of daywear! Via the Persian expansion, the word reached India in the Hindi form ‘paijāmā’. When the British colonised India, they brought the clothing and the name back, though decided it was much too comfortable for day use.