I just found the following YouTube video
It's 30 minutes long and shows a model shoot(which, on a sidenote, also serves as an overheating test for the camera which was run for an hour and a half).
Apparently, the model had her fly unzipped at some point during the shoot, it can be seen at least two times in the video
The video is available in Full HD (1080p) and even in 4k resolution, so don't forget to switch to Full HD/4k and full screen for maximum pleasure (and probably the sharpest moving images of an unzipped fly I saw so far).
Here's the link to the video:
youtube.com/watch?v=KSvM_JpVBTk
Cheers