I'm telling you, I play against marpat guys in the fall against that exact kind of ground, they are literally INVISIBLE when prone. The only foliage in there is a foot off the ground and 6 feet in the air, so what you want to blend into is the deadfall and the trees.
Multicam works, but it's a MULTI-CAM, not a specific environment camo. And you don't have enough foliage at crotch to eye level to use cadpat effectively.
Although multicam would absolutely work, it wouldn't work nearly as well as marpat.