It's got nothing to do with other content, if you mean other content in the scene.  Even if I load just the P4 clothes, they have holes in preview. 

I tried copying the P4 clothes - obj, textures, etc. from a new install, thinking maybe the content update was the problem, but it persists.

It's not too big a deal since I don't use P4 clothes except in this test of the WW demo, but it is making it impossible to see if WW is worth it for my use.