Tim,
I don?t know exactly what a suit jacket would do, but from old Doc Edgerton high speed bullet impact photography that I have seen, I think non-friable objects like a jacket with lapel wouldn?t locally obtain the speed of the bullet that had just passed through it so it would make sense that with the lower resultant jacket fabric velocity it would have a maximum observable bulge-out not immediately, but shortly after a bullet passed through.
In this case a frame or two delay from a bullet penetration to maximum observable displacement extent may be reasonable.
If that?s the case then with a maximum coat bulge around z224, if caused from a bullet, the bullet would have struck a frame or two earlier near z222/z223.
Now this interests me for the following reason, and if you have a good resolution version of z-frames in this time period, I would like you to check and comment on the following.
In the past I had looked at Costella frames around this point, and saw the lapel flip that has been discussed at z224. I also saw at z222 a white spot showing on Connally?s jacket, on the front lower right side. The white spot was showing over the jacket, not in alignment with the white shirt so I dismissed it as a reflection off of the top edge of the door or parade bar or something.
I not long ago looked at MPI version of the frames enlarged, and now think the spot may be the white right shirt cuff of Connally showing and observable just above and behind the edge of the limo. When I look at a few frames later z228/229/230 the same spot appears and now seems to be more clearly recognizable as the white shirt cuff.
The significance here is that if this is the shirt cuff and possibly the wrist/hand just to its right, it disappears extremely rapidly between z222 and z223, as if it has been driven down out of sight by something. Coincidentally, the position of this spot appears near the chest below the right nipple area.
To my eyes, something on the film changed very rapidly here near z222/z223 just before the lapel flip is seen. Is this something that has been discussed and explained away before?