I do not know of any company that advertises "patent material". Usually it is referred to as PVC. It is technically plastic but not the cheap stuff it is more like what you would get with a nice raincoat. I would suggest looking at
http://www.LipService.com They have been a definitive source of alternative clothing for 25 years. They have some nice high quality pvc. If you have a local alternative clothing store in your town you may be able to see and try on the piece. I find that your run of the mill sex stores do not sell high quality pieces unless they are fetish store. I would not suggest latex if this your first venture with this type of clothing. Quality pieces are super expensive and can tear easily. Stretch Pvc gives you the same look as latex but does not tear as easily and is cheaper and thicker. You want something with a little stretch to it for the best fit.