I don't know much about back braces, but I gather JFK was wearing one. I
think the WC even has a picture of it, nice and clean and neatly folded.
Very thorough people, those commissioners. But, I've been studying Jackie
in the Zapruder film, and after Connally shoots her husband, she doesn't
yell at the Gov. and doesn't look into her hubby's face. No, she looks
lower than that, to JFK's lower abdomen, and she seems to be fiddling
around with something. I think it must be the back brace. It has straps
that come around the front, and perhaps she was trying to loosen them so
that Jack would be more comfortable. Yes, that must be it. That's what a
good wife would do, loosen them straps. The Nix film also shows this, from
the other side. Only, from there you can't see what she's doing in front
of JFK. But, she seems to be adjusting the brace in the back, too. Very
thoughtful! And so calm and cool, considering the circumstances. She would
have made a fine nurse, Jackie! Yes, indeed.
http://www.youtube.com/watch?v=6NwYedFWiAg&feature=plcp