I understand how to "pin" a shirt to stay on the body during a simulation, but I can't find a tutorial that shows how to keep a waistband in place. They seem to skip that step and it "magically" stays on. In this case it is a just a loin cloth to be exported to Poser for a male figure.

I am used to creating a constrain group in Silo that holds a garment on the body.

Have not done much of this myself but hopefully here is some information that may help Using Constraints in Animation and VscorpianC has a few clothing tutorials that might not be exact but she does cover some animation/simulation with clothes that might have the answer your looking for https://www.youtube.com/watch?v=gQjT0IxfP-k&index=13&list=PLP3-5QSIC-VesbHC0kgYVQGV2cNUFw4D0 I do hope these help some and I am sure one of our other members will jump in soon with some answers themselves

Good Luck

Thank you. I'll check it out :)