[Hectic]

Its not gonna be easy to find. Just finding a legit cadpat bdu can be hard. All that stuff belongs to the queen n she dont like givin it away while its still in service.
Ive been searching for a full set of cadpat goretex for some time, you prety much have to walk into every surplus store you can find in person and poke around and ask, and even then if they have they may not give due to the legalities.
see my previous post for the poncho. They are good and csn be used as shelter as well. Over gear in a pinch. Just leave the zipper open and use the velcro incase u need to get at mags N such. but yeah under your rig can work too, more likely to leak tho. And depending on temp as well. Ive been known to wear boxers and a tank top under goretex sock, pants and jacket when its hot out.