I'm confused!! I can understand a pair of socks or a a pair of shoes but I don't understand a pair of pants?? If a pair of pants consists of not one pant but two pants I can only conclude that each leg opening must be a pant. If a pair of trousers consists of not one trouser but two trousers each leg must be a trouser and two trousers makes a pair. I wonder why a shirt is not called a pair of sleeves??