And here's a prop set, including my testing cloth patch, two boxes to show how to "pin" selected vertices, and a box against which to collide.  Change the extension to .pp2 and open it from the Poser library.

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Cage can be an opinionated jerk who posts without thinking.  He apologizes for this.  He's honestly not trying to be a turkeyhead.

Cage had some freebies, compatible with Poser 11 and below.  His Python scripts were saved at archive.org, along with the rest of the Morphography site, where they were hosted.