For the mannequin, I just zeroed V4 in Poser and exported the right and left shin, foot, and toes as obj. files.
I box modeled the boots around the legs using Hex.
Autogroupeditor and quick conform are both by MarkDC. Many people seem to have trouble with his stuff, but I've been using it a long time. I'm sure there are other applications that people can suggest that are maybe a bit more user friendly.