Thanks for posting that visual aid. That individuals hands are nowhere near his buttocks. To be fair, I would need to see what the situation is here. It appears he is running and simultaneously struggling to put the jacket on.
Never said it represented exactly what happened to DCM's jacket went the wind caught it. It was a counterpoint to your description of the wind puffing out a heavier-weight coat.
Bothun photo: Jacket seems open.
Bronson photo: May be keeping jacket closed with left hand.
Towner photo: I believe there is still some air trapped at the shoulders and back that is puffing up the jacket.