Ok here is snowboard jacket construction 101
As you said, two to three layers of fabric. The outermost layer must be a waterproof nylon, either a Gore-Tex fabric or a nylon fabric that has been treated with a teflon coating on the inside. The stitches of this layer must be heat taped or else moisture will get in, either that or just forgo stitches altogether and use a thermal press to glue the fabric sections together.
The middle layer is a synthetic fibre for warmth and is optional depending on how technical the jacket is going to be. I recommend using Prima-Loft. it's a thin fabric thats breathable and is used in very high quality sleeping bags, you can get it rated to either -5 degrees, -15 degrees, or -30 degrees. The colder it's rated for the thicker it will be.
The inner layer should be a breathable mesh or thin fabric that will wick moisture from the wearer.
Your jackets must have a powder skirt at the waist of the jacket. I recommend doing one that is removable so someone can use the jacket for street wear. The powder skirt must have a strong elastic band around it and is best when it either snaps or zips into the pants.
Hood: The hood must be able to cover the mouth to protect from wind and is best when it does not obstruct the wearers blindspots.
Pockets: The two or four outer pockets must be sealed and moisture proof. line the pockets with a soft material that warms hands. The inner pockets should have zippers as well to protect from moisture, one pocket should have a little sleeve in it for the users iPod. The other pocket should come with a little soft cloth for the users goggles and is best when on a small elastic leash. There should also be an easily accessible goggle pocket on the inside.
Zippers: Use high quality plastic or even higher quality metal zippers. They must be able to stand extreme cold and extreme stress. I recommend RiRi Zippers.
Cuffs: The cuffs of the jacket should have a velcro strap to close the cuff around the wearers gloves. It is also a nice feature if you include cuff gaiters that the user wears around their wrist and seals the sleeve from snow.
Many Thanks. These are great comments. :-)