Hi. I have a character for which I made a basic FBX file (in Marvelous Designer) of a very simple loin cloth.
I've tried the manual and every tutorial that seemed appropriate, but I'm missing something about getting proper conforming of cloth on the animated character. 
Also, when I most recently took my character back into CC, I could no longer access the Conform menu??? 
Any ideas, please? Thank You - kev 

I meant to include this example...Thank You. 

I can't speak for Marvelous Designer, but I export OBJ clothing from Daz, bring it into Blender and rig it onto the default avatar exported from CC and it works fine.  Perhaps one of my tutorials will help you:

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You could export your clothing from MD and bring it into Daz the same way -- that should work.  My hunch is you didn't rig the clothing properly (which my tutorial should do for you in Blender)

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Alienware Aurora R12, Win 10, i9-119000KF, 3.5GHz CPU, 128GB RAM, RTX 3090 (24GB), Samsung 960 Pro 4TB M-2 SSD, TB+ Disk space
Mike "ex-genius" Kelley