Single Convex Hull Cloth Collisions Not Working

I am trying to set up collision for a dress on a character. In the contents folder, I right clicked and chose Physics->Physics Asset to create a new physics asset for collision setup. Then I choose the character’s skeleton and I select Single Convex Hull to use as the collision objects. Why won’t the dress collide against the convex hulls that have been created? You can see that her thighs and legs are poking through.because the dress is not colliding against the convex hulls of the thighs and legs. I had made sure that the cloth has been set to use this newly created Physics Asset for collision.

Did you find a solution???

This does not seem to be that well documented as far as what does and does not work. I have the same issue with hair.