I would think Lafemme has enough polys to not need all that subdivision. I've certainly had displacement work fine on V4 clothing (in superfly) without needing subdivision at all. But there are props I've had to crank up to 4 to get any detail, which can really eat up some render time. I suspect the cylinder primitive does not start with very many polys.

On the lafamme yoga pants, did you try simply raising the displacement value?

I'd also be curious if you get the same results switching to a PhysicalSurface root node instead of the Poser root node. I've mostly been using PhysicalSurface on props where I have to do any work with the materials.