Hmmmm, interesting.

Right. Had some issues with the mesh that needed sorting out. I can't really divulge whose mesh this is, but I had to add a edge-loop to the part right under the bust (bra bit) to get rid of some artefact, apparently caused by Poser's smoothing thingie. So, I took the mesh into Blender, added the loop, exported back out to obj and imported into Poser and turned it back into a figure with Obj2Cr2. One incredibly brilliant tool!

So, loaded the tweaked shader on the slip-portion of the nightie... the rest has been GCed but nothing else was done to the rest of the garment:

So, is this nylon?? It kind-of looks like it, but would you be happy with it? Or is this image the result of applying a material node set designed for another type of mesh? Well, legs... you know.

Anyway, the tweak is up for grabs, if you want to have a good laugh. Oh, and the mesh probably needs a bit more detailing where it bends: you can see artefact (those vertical lines) developing there.

Monterey/Mint21.x/Win10 - Blender3.x - PP11.3(cm) - Musescore3.6.2

Wir sind gewohnt, daß die Menschen verhöhnen was sie nicht verstehen
[it is clear that humans have contempt for that which they do not understand] 

Metaphor of Chooks