Death Prophet used to have a "vortex" item slot for the effects swirling around her dress. That slot got deprecated and all sets which used that slot had that item merged with the legs slot item.

For example, this was the vortex slot item of the Vesture of the Unkind Countes set. It got merged into the leg slot item.

But the vortex effect of the Outland Witch was not merged, it was instead moved into the misc slot. This means, you can currently combine it with any dress item, creating these