Billy Pilgrim dressed himself. He put on the little overcoat, too. It split up the back, and, at the shoulders, the sleeves came entirely free. So the coat became a fur-collared vest. It was meant to flare at its owner's waist, but the flaring took place at Billy's armpits. The Germans found him to be one of the most screamingly funny things they had seen in all of World War II. They laughed and laughed. (5.7.3)
There at the corner, in the front rank of pedestrians, was a surgeon who had been operating all day. He was a civilian, but his posture was military. He had served in two world wars. The sight of Billy offended him, especially after he learned from the guards that Billy was an American. It seemed to him that Billy was in abominable taste, supposed that Billy had gone to a lot of silly trouble to costume himself just so.
The surgeon spoke English, and he said to Billy, "I take it you find war a very comical thing." (6.21.1-2)
Billy Pilgrim got onto a chartered airplane in Ilium twenty-five years after [going to Slaughterhouse-Five]. He knew it was going to crash, but he didn't want to make a fool of himself by saying so. (7.1.1)