The plural form of "underwear" is still "underwear". However, let's take a deeper dive into this! In English, some nouns stay the same whether they're singular or plural - these are called uncountable or mass nouns. "Underwear" is one such word. It's used as a collective term to describe a category of clothes we wear beneath our main garments. Whether you have one pair or one hundred pairs, it's all just 'underwear'. Like many things in English, it's a quirky exception that keeps us on our toes!
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