thru-hiker.com Liberty Ridge windcoat
you have to sew it (or find a friend that can), but it is a great pattern, easy to modify, and works well. The kit costs about $30, including the pattern, which you only need to buy once.
My first LR is 4-5 years old, and has been used quite a bit, and is still going strong. It is made from the basic 1.1 oz ripstop, with a full molded zipper and hood, and only weights 3.5 oz!