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For more permanent parts, use both strips and strands of burlap. Try to dye different parts to match the colours of local flora. The most important part, however, is to use plants from the local area. Use grasses, moss, bits of bushes and vines. As much as a good Ghillie can hide you, if someone is looking for burlap/jute, there's not going to be any of that naturally, other than what you're wearing.