What better way to add to the humiliation of the boy you have just spanked than to confiscate his pants, so that his sore bare bottom is exposed to any and every casual stranger and passer by?!!
"I don't care if your buddies will be calling by at any minute, your pants have been confiscated, and they are staying confiscated!! Now carry on with your chores, or they will see you going back over my knee!"
"Keep scrubbing! you will not be getting your pants back until this house has been cleaned to my satisfaction!"