Would you say underwear or underwears?

My best friend and I disagree. I say that it is underwears bc u have a pair of underwears, but she called me dumb lol and said they are underwear. But you see, they don't call them panty they call them panties, they don't call them boxer they call them boxers, lastly they don't call them chony they call them chonies. So what do u think?

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