The main difference between trouser is used in the UK whereas the word pants is used in America.

The History of 'Pants

Why do Americans use the word 'pants' when the British use the word ' trousers'? - Quora

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TROUSERS definition in American English

Why do Americans use the word 'pants' when the British use the word ' trousers'? - Quora

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A History of Trousers and Pants in Western Culture - Bellatory