Hi CamperMom,
Thanks for your post.
- Waterproof zippers can be bought from seattlefabrics.com you can glue them with silicone before sewing then spray silicone on the stitching. I don't want to use separating zippers.
- Double fabric IS for reinforcement against wear but also for kneel and sit in wet conditions. In the knees anything waterproof and tough would do. The problem is the but because it will sweat.

I rather find something with pads already on and just add the zippers.

In fact I found these pants:

Keb Eco-Shell Trousers $449.99

They are exactly what I want but did you see the price??

If anyone knows of a good quality unlined softshell with protective waterproof reinforcement please post!!!