The utter absurdity of the bunched-clothing theory becomes obvious when we consider just how much the coat and shirt would have had to bunch to account for the location of the rear holes in JFK's coat and shirt.
The rear holes in the coat and shirt were just over 5 inches below the top of the collar (coat: 5.375 inches below the top of the coat collar; shirt: 5.75 inches below the top of the shirt collar). These holes locate the back wound at around T3, the same location established by the back-wound dot on the autopsy face sheet, by the death certificate, by Dr. Ebersole's description, and by the wound diagrams that several witnesses drew for the HSCA. However, the single-bullet theory requires that the magic bullet struck at C6 or C7, that is, at or slightly above the base of the neck.
Leaving aside the fact that the autopsy photo of the back plainly refutes the C6/C7 location, a bullet striking at C7 would have made a hole in the coat that was no more than 0.5 inches below the top of the coat collar, and would have made a hole in the shirt that was no more than 1.0 inch below the top of the shirt collar.
Now, just imagine how much the coat and shirt would have had to bunch for the bullet to have made a hole in the coat that was 5.375 inches below the top of the coat collar and a hole in the shirt that was 5.75 inches below the top of the shirt collar. The coat and shirt would have had to bunch at least 4 inches.
Just to be extra generous and cautious, let's add half an inch to the distances from the tops of the collars. That would mean that the coat and shirt would have had to bunch at least 3.5 inches to make the clothing holes fit the C7 location.
However, no photo or footage of the Dallas motorcade shows JFK's coat bunched 3.5-4 inches. The two photos taken right around the time the shooting started (Betzner 3 and Willis 5) show no large bunch in JFK's coat--indeed, Willis 5 seems to show the coat lying flat on JFK's back. And, how in the world would the tailor-made, buttoned shirt have bunched that much, and how would it have done so in nearly perfect correspondence depth-wise with the coat? It's just preposterous.