Ever heard of Ty-Vek suits?
Painters use them, environmental construction uses them. They are all white paper thin overall's with a hood made of a fiber/cloth material.
They are pure white with a zipper in the front and cost about $8.00 each. Buy them over size to wear your warm clothes underneath. If you get them loose enough they should last you a long time, say 3-6 trips. If not you'll blow out the crotch.
For extra camo you could have someone paint dots or lines on you to match the local area.
Look for them in paint shops, Home Depot, safety supply, and medical supply shops.
Steve