[Joni]

Just me, but I haven't used neoprene in years.
I fish year round here in the rocky mountains. I wear Orvis nylon medium weight pants and top (Orvis has been the best that I have found, but they are not cheap) a pair of Smart Wool socks made for fishing with the thinner material at the ankle. I wear regular light weight pants over that with a heavy sweatshirt to the river where I will then put on the Fleece Bibs with the foot stirrups and a wool jacket instead of the sweatshirt which is made of cotton (cotton is a no, no). On the really cold days I will wear a down filled shirt over the wool jacket. Top that off with my breathable waders and a tailwater jacket and good gloves with the disposable hand warmers.
These days, I would say with the proper under garments, you really don't need neoprene. Breathable are also wind resistant which does help to keep you warm. I always sweat in neoprene which is not a good thing.
With what I described, I fished the snake at 11:00 p.m. on Thanksgiving in Idaho Falls, and the only thing that got real cold was my finger tips (fingerless gloves) and my nose.