I've heard of guys pissin in their areas so the bear get used to that. Seems weird to me but I think Jester a shirt is a good idea. We did that with our babies to get the dog used to the new smell before they came home from the hospital. Has to work for other animals too! I'd try to get the shirt in the air too and secure in a way that in moves around in the breeze so they get conditioned to motion as well.
Good luck,
Jono
Good luck,
Jono