This quickstart tutorial goes through the steps of setting up the cloth simulation in Houdini, constraining cloth to body, and finally attaching small geo parts (like pocket flaps) to cloth object using cloth deformer.
NEW: project start file link: https://goo.gl/ncdPRB
Also check out the following tutorial for how to setup the character rig and apply motion capture data (filmbox format) to the the character rig. https://youtu.be/HnVSvfnlPK4