There are several places in the Spanish course where the answer to a single pair of pants is given as a 'pant'! Pants is a plural word that does not have a singular. So when we say 'Put on your pants' you only put on one pair! (I hope)
A dog can pant, but that is not a pair of trousers (pants).
I dont remember it any more. I wanted to report it as a mistake, but since the new website, I am not able to report problems any more -it appears to be some incompatibility with my browser maybe -as nobody else seems to have that problem?
I have actually come across it a few times.
It's the fashion singular, sweetie dahling. :-D http://www.theguardian.com/fashion/shortcuts/2013/sep/18/tom-ford-fashion-singular-❤❤❤❤