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Because the two socks are not connected right?
So trousers and tights I get, two legs, connected at the top. But, pants? There's only one pant. There's no legs to have two of, everything is one.
If pants are a pair, why is a bra not? It's got more multiples of parts than pants.
Is it only legs that can have pairs? If not then why are tshirts, jumpers, shirts, jackets etc not pairs? There's (usually) two sleeves.
Gloves are pairs but they're like socks and aren't connected. Are oven gloves singular or a pair?
Ugh? One pair of socks, two pairs of socks. One pair of scissors, two pairs of scissors. What's so hard about that?!