I have a pertanyaan about movie costumes

I hear some actors and aktris say they get to keep their costumes if they request it in their contract? Does anyone know if that is true, I am not very good at looking things up on that level. I do know that as far as tampil case costumes, if it is true the ones in the tampil case are usually the double that is made atau the actor atau actress owns it but its on display. Anyone know anything.??? I would cinta to keep all the costumes that I wore I was an actress.