Why jeans is used as singular while trousers is used as plural?

or:Why jeans is used as singular while trousers is used as plural?or:They're used in the same way, aren't they? I'd refer to a pair of jeans just lik

or:Why jeans is used as singular while trousers is used as plural?

or:They're used in the same way, aren't they? I'd refer to a pair of jeans just like a pair of trousers. Same for knickers or panties. The odd one out is underwear for me. It's singular as underwear but plural when it's shortened to undies. Very strange.

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