SAM: You hadn’t done anything wrong, but you went around as if you owed the world an apology for being alive. I didn’t like seeing that! That’s not the way a boy grows up to be a man!... But the one person who should have been teaching you what that means was the cause of your shame. If you really want to know, that’s why I made you that kite. I wanted you to look up, be proud of something, of yourself… (Bitter smile at the memory)… and you certainly were that when I left you with it up there on the hill. Oh, ja… something else!... If you ever do write it as a short story, there was a twist in our ending. I couldn’t sit down there and stay with you. It was a ‘White’s Only’ bench. You were too young, too excited to notice then. But not anymore. If you’re not careful… Master Harold… you’re going to be sitting up there by yourself for a long time to come, and there won’t be a kite in the sky. (Sam has got nothing more to say. He exits into the kitchen, taking off his waiter’s jacket.)

What is the significance of Sam taking off his waiter’s jacket in this scene from Fugard’s "Master Harold"…and the Boys?

It accentuates Sam’s warning that someday the two of them will be equals.
It illustrates Sam’s sense of duty and his subservience to his white employers.
It conveys Sam’s sense of helplessness and resignation about his social status.
It demonstrates Sam’s willingness to compromise in order to resolve their conflict.