Quote - JCMs are Joint Controlled Morphs.  You will probably need to set these up at least at the knee, so that as it bends it will change the shape of the trouser to follow the character's leg, and maybe other places as well.
http://www.nerd3d.com/modules.php?name=Content&pa=showpage&pid=8

Thanks, I have the page bookmarked for future reference. Right now I'm just working on a set of belt and suspenders so I don't think I'll need the info yet. But I hope to eventually get into more complex stuff like pants and clothing.

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