Found some more pics and also some videos
The girl on the left has her zipper down during the whole video:
youtube.com/watch?v=6PXJ0Oe9dFs
The girl in the middle has her zipper down during the whole video (at first, it's like halfway down; later at around 10 min 20 sec, it's completely down):
youtube.com/watch?v=7wJ6DxwGvbg
Three videos of the same girl with her zipper down:
youtube.com/watch?v=atDC_yciAnE
youtube.com/watch?v=rbuD_QHS_0Q
youtube.com/watch?v=WFB7OMVOX9s
Two other videos:
youtube.com/watch?v=RSOCS5d2YPY
youtube.com/watch?v=kcA0xIRzQUc