Why don't you just do what most of the snipers I've ever known, seen and come across do? In REAL life, they just wrap an old face veil or scrim netting/sacking tied around the rifle and tie it with some bailing twine. We had a saying about camouflage and it went something like this. Nature never comes in straight lines, straight colours or perfect radii. You camouflage bearing in mind all the S's. Shape, shine shadow silhouette and a few other S's that I forget now. Same as your binoculars. Wrap them in scrim.