sorry but leggins from PVC and from patent leather are two different things for me... not only those from leather look better but also comfort of wearing them is much better - ( leather is natural fabric , PVC not )
as I know only one company make this patent leather and that's why buying leggins from it is so difficult , the process of making this fabric is also very expensive so rather only good brands decide to make leggins from it and that's why they can't be cheap...
I've seen several companies advertise their leggings at patent leather, and they are made from nylon\spandex.
Express is one I can recall at the moment. It's much like Bloomingdales calling their leggings latex, when they were actually 'latex look' and made of polyester\nylon\spandex.