Try using "woodland" in your search. Make sure you get cotton and not nylon. Sometimes that info is missing from the description. I just assume it's not cotton then.
Here's a site with ACU fabric (in case you're interested in modern camo).
http://www.vtarmynavy.com/acu-pattern-fabric.htm
Some greens:
http://www.seattlefabrics.com/camo.html
There's a large variety of "salad suit" fabrics out there. Good luck.