"To whom do you wish to give the trousers?" is correct and also accepted.
"Who do you want to give the pants to" may not be TECHNICALLY correct, but that is how probably 90+% of American English speakers would say it, and I think it should be accepted.
--------- absolutely. i think the % is much higher ! . . .
Big 11 apr 19
Nu ar fi mai corect "Whom do you wish to give the trousers to"?
That sounds like older english though. It is correct semantically and gramatically.
------- obsolete grammar says that the "to " should be at the front: to whom . . .