EDIT: I love the internet. Within moments, nowhere informs us that the vest came from an Action Jackson doll. And sure enough, with a little searching, I found one here: http://www.megomuseum.com/actionjackson/accessory/airforceac.html
Found in "Bats In The Dark" by John Kaufmann. Published by Crowell, 1972.
-Click to enlarge photos-