Near the end of Good Morning Vietnam, Adrian Croneur is suspended from his duties as a deejay, Twan tries to comfort him by taking him to see his village. Adrian drives only a certain part of the way and they must walk the rest of the way. When they start walking through the trees, Twan has a white shirt and in the next scene, when they see the Buddhists meditating, Twan has a reddish-blue checkered shirt. I don't think he had a shirt hidden in his pocket.