How come they call it a pair of underwear, when it's only one item

Answer (1 of 4): One wouldn’t speak of “a pair of vest”. But you WOULD speak of “a pair of socks” (because they come in twos!) and “a pair of (under-)pants”… probably because pants originally came as two separate legs. Which, back n the day made the “Can Can” rather more of an R-rated/X-rated dan

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