Ah, I thinkyouguys hit on the problem.  The designer of the pants might have been too smart for me.  I Had so many face morphs in the character that I designed that I baked them all down into one morph (including the full body morphs.

If the pants are supposed to be smart, then they obviously would not recognize my custom morph (though made fromt he original Daz morphs.)

I'll try some experiments and see.

Thanks for the answers.  I hate puzzles that I can't solve.