Time to start fiddling with joint settings and scaling. First try scaling up the area that pushed through. Lookin at this I'd try XScale 102% on the hips of the chain mesh. You may need to change the sacling on the rThigh too. You can also try increasin the, um lessee I think its right posative Bulge for the rThigh. If you'll be using this figure combination a lot you may want to build a clothing figure out of the two OBJ files. Somebody did a tutorial in this.