There is a very good book "Scottish Estate Tweeds" by Johnstons of Elgin that will give you a very good idea of early camouflage. They are as good now as a hundred and fifty years ago for "disappearing" into the hillside. No so good for keeping the weather out, but good heavy tweed still is much better than some materials . You may think some of them are pretty loud, but the colours and patterns are there for a reason as they will blend into the colours of that particular area(estate), which in Scotland could well be very different to some ground twenty miles over the hill.Not much good on Inverness High Street though!