its in the readme :)

all it does is selectively turn OFF the JCMs in the tyler figure.

so there are at least two ways you can use it:

1. if you are making conforming clothing, its more straightforward to do a first pass and conform them to a JCM-less Tyler, then re-enable the JCMs and match them in your clothing.

2. if you make a long-sleeved shirt, and for some reason DONT want to support the bicep/tricep flex JCMs for example (but you should, looks way more realistic), then you can bundle the JCM control with your clothing pack and either instruct the customer to click the Arm-Biceps JCM OFF and Arm-Triceps JCM OFF poses -- or better yet call them yourself in your clothing item via a readscript pose.