Watch how the corner of Collins' jacket moves at the 00:52 time mark of this clip.
Apollo_11__The_TV_Transmission_Conspiracy_Theorist s_Hate_.mp4
https://www.youtube.com/watch?v=6fqdB1b53jc
If that link goes dead, it can be seen here at the 17:52 time mark.
Apollo XI: The Little Gem.
https://www.youtube.com/watch?v=60aDXP0iV5o
The corner of Collins' jacket swings back and forth the way it would in gravity.
Look at the corners of the jacket the woman astronaut is wearing in this clip.
Discovery Crew Enters International Space Station
http://uk.youtube.com/watch?v=TejsnPThmd4
That is real zero-gravity and they behave quite differently.
The movement of Collins' jacket corner is very different from that of the straps in this clip which is in zero-G.
Our World: Exercise Equipment
https://www.youtube.com/watch?v=1ofwzby1c7o
(3:17 time mark)
It looks the same as the movement of this guy's jacket corners in gravity.
ISS space station treadmill running
https://www.youtube.com/watch?v=DTNGNW5Evs4
That footage was not taken halfway to the moon. It was taken in strong earth gravity. One possible explanation is that they were trying to fake zero-gravity in a diving plane and the plane wasn't diving fast enough at that point.