'you' actually *became* a singular pronoun at a particular point in the history of English. this is not clearly true about 'they', which seems to have been the unmarked, ungendered singular pronoun for as long as the recognizable personal pronoun system has been in place
there was, however, a historical moment when a bunch of 'grammarians' (again: made-up job!) with a boner for Romance languages began to insist that 'he' was a gender-neutral pronoun. this seems to have never taken root in the spoken vernacular, ever
@byttyrs pants historically were act sold as two separate tubes that you tied to a belt to make one "pair"! It took them a while to figure out how to do the seaming to fuse both legs into one object and also it was an aesthetic to have two different colored leg tubes so you'd buy them separately so you could mix and match.
I just have weird pants trivia so I wanted to share!
Source: costume history class in undergrad
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