Tweed, or rather a bespoke woven estate tweed, is cammo. When Haggart's was still a proper tailoring concern you could look at the tweed pattern books. Some tweed was a dark dark brown. A pest colour in fact. Or that of rank heather. Some tweed was near blue like the French WWI 'Horizon Blue' or others a slate or shale grey blue like modern US Navy cammo. On some estates with lots of exposed rocks and boulders or limestone pavement and such the tweed was a nearly a light grey. Green as in grass green or olive green tweed almost seemed a rarity.
When I had my shooting suit made by them I chose a tweed that most resembled American "Marsh Grass" cammo as by coincidence the estate in Scotland where I then shot and my own pond in Leicestershire was that yellow "gone over" grass and dry reed.. So I asked Haggart's to see what tweed they had nearest to this American "Marsh Grass" cammo. So my shooting suit is almost a yellow ochre hue.
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So in reality tweed is cammo. That Jack Pike, Keeper's Tweed and etc., etc. is green or olive green doesn't mean it would actually be a practical stalking tweed on many estates. For the latest scheme of today's British Army cammo would be more practical.
HOWEVER WHAT BETRAYS YOU MOST IS NOT LACK OF CAMMO OR LACK OF MATCHING BESPOKE ESTATE TWEED IT IS LACKING OF BLOOMIN' WELL KEEPING STILL AND KEEPING QUIET! ESPECIALLY THE FIRST IF YOU MAKE SUDDEN MOVEMENT.
In that respect learn from those times you go shooting grey squirrels. The squirrel that doesn't move is hard to spot. But as soon as he moves he's dead (if you can hit him). How many of us have stood stock still waiting for that tell tale peep of the squirrel's head around the tree trunk and then "bang" goes your gun.