"He needs pants."
Translation:Ему нужны брюки.
The question that doesn't want to leave my head... Брюки are the British or American pants?
Some American slang: The verb "To pants [someone]" means to suddenly pull down their pants in public - counting on them wearing undergarments, usually. So, if you said "He needs pantsing", that would mean "he needs to be humiliated in public by having his pants pulled down."
A teenage prank. But then, see the movie "Meatballs" starring Bill Murray. Great pantsing scene in that.