And this is something different. Instead of making hybrid use normal full conforming clothes (in the picture above casual_pants unchanged) and run simulation only for body parts you need.
In that picture after conforming casual_pants to human figure I made 3 simulation for: -lShin, -lFoot and -rShin from casual_pants (-rFoot of casual_pants is without simulation - to see the difference) and the result is very good I hope.