Quote - I have noticed pokethrough which is not visible in preview after rendering too. I have fixed it before by lowering the crease angle but I would be interested in hearing of any better solutions.

I am surprised that works...  Crease angle doesn't change the mesh, it's just a threshold between contours that are rendered sharp and those rendered smooth.

I have noticed very small bits of pokethrough in renders that were not visible in preview and learned that those spots are usually visible in hidden line mode as a vertex with edges appearing to intersect the overlaying mesh.  I just use the morph brush to pull the clothing outward in that area until the underlying vertices don't show.  Try fitting your clothes tight to your figure in your normal preview mode and then switch to hidden line and rotate around your figure.  If you see extra vertices that don't seem to be a part of the mesh, they are part of the underlying mesh and that's where pokethrough will likely appear in your rendered image.