Need help with animating Pants with cloth simulation

I am trying to animate pants in blender. I have tried all sorts of combination for animating using pants. Cloth simulation is by far good but when the body bows down …it doesn’t simulate accurately.
I tried with 30 quality steps and 10 collision steps. It took me 4 hrs to bake 250 frames and result is like below (not satisfactory)

I want to learn high quality animation and not intended for use in games. How can I get high quality animation of clothes?