I have found out that those robes do not like shoes. Many of them have issues, at least on my character - female altmer. when using various boots there's an empty space visible between boots and legs, so that it looks like legs were cut off yet still were attached by some magic. This is the worst in case of thalmor boots. Other robes (which share simmilar geometry) work fine, so i think the problem is easy to fix and i really would love to see it fixed in some patch.

Here's the screenshot to visualize what i mean: http://yessmasster.ovh.org/boots.jpg