I have a প্রশ্ন about movie costumes

I hear some actors and নায়িকা 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 প্রদর্শনী case costumes, if it is true the ones in the প্রদর্শনী case are usually the double that is made অথবা the actor অথবা actress owns it but its on display. Anyone know anything.??? I would প্রণয় to keep all the costumes that I wore I was an actress.