I've been trying to figure out what these WPB systems are all about so i can recreate it cheaply, but due to the vague explanations it's been hard to figure out exactly what to do.
But, i think i may finally have "cracked the code". This is what i'm going to try at least: I have a micro-polyester fleece with a pile fur side and it is reversible (i'm going to also add a hood to it). I'm going to shave down some of the pile because i don't think i need that length. The "fur" part will go on the outside. I'm going to wash and rinse it well with some Dr. Bronners soap, also will pre-treat my Washing machine with boiling water/rinse cycle to get rid of any detergent residues.
Then i will soak the M.P.F. in some Grangers Washin Waterproofing product.
I'm taking a light, thin Polartec Powerdry shirt to use as my "pump liner". I believe these are treated to make part of the fibers more hydrophillic. I'm going to soak it in a hot, soapy and weak Oxy clean mix solution to help get rid of some of the chemical finish that may be on there. Rinse very well, and also treat with the Grangers Washin product.
Then i'm going to wear the Polartec Powerdry shirt inside out, but i will experiment with wearing it normally as well.
Has anybody tried similar combinations to re-create this stuff?