Please assist me in skinning my first bipeds' waist and thighs!

[tcircleediting]

Hello there!  I started this model a while back, and while skinning is going okay in most areas, this one needs work.  I have tried weighing, re-weighing, and multi-weighing vertices, but somehow I can't seem to fix one spot without making another look bad.  This may not be an exact science, but hopefully if I provide some screenshots, people will know what is wrong with this.

As is hopefully visible in those shots, the skin where the leg leaves the waist is bent weird; a straight line that is at odds with things on both sides.  I am open to the possibility that maybe there aren't enough vertices here, or maybe this is where a skin morph is used, but I would like to know if there's a simpler solution based on weighting vertices differently.  I will provide more screenshots on request.