Ok, here's me wasting everyone's time.
You have a pair of pants. Why do people call them a pair of pants instead of a pant? Are there 2 of them? Is there an invisible twin? Same with underwear, shorts, it just blows my tiny mind. Some of you might say, "Hey dip$hit, there's 2 legs!!!" but then why don't people call a sweater a pair of sweaters? If you have a pair of shoes you have 2 shoes.