I think there are two very different intentions if we talk about blending into the surrounding. And the resulting equipment that is the best choice is very different.
Hunters and nature photographers as well as the military want to blend into the natural landscape as good as possible.
It is sensible for them to achieve the highest degree that's possible.
For them wearing camouflage patterns and using camouflage netting is sensible.
And they don't have to care about possible reactions of civil persons they meet somewhere because such camouflage suits are simply their work clothing like the white clothing of medicines is usual in a hospital.
Something totally different is what is sensible for hiking, bushcraft and stealth camping.
I own some camouflage clothing because the used military surplus clothing in good conditions is usually a very good deal.
That's usually outstanding good stuff and they throw it behind me every corner. But I wear it mainly on our own ground and around of it, where people know me or where it doesn't matter, because I am just walking around and not stealth camping.
For stealth camping I use plain olive green, brown and grey, in some hot and dry areas also coyote brown and sand coloured clothing. And I mix these colours. In Germany for example usually brown boots, grey socks, brown trousers, brown belt (like the earth) and sand coloured or coyote brown T-shirt (less warm in hot sun shine, I don't set up the camp before sunset anyway) olive green shirt (like the leaves) and waterproof jacket. The fleece jacket is brown, because when I use it usually there are no leaves at the trees anymore and if worn under an open olive green rain jacket it looks from a distance like the trunk in a young tree. The cap I choose in brown or green.
The colour spots that I wear here have approximately the size and mixture of the pattern that European armies paint onto their cars and tanks. The like this created pattern works pretty well if seen from a distance. And the animals don't see me anyway if I don't moove.
If I sit or stand now between some trees or bushes I am totally invisible for humans and animals, because the vegetation in front of and behind me breaks my shape and paints additional smaller spots and lines onto the image.
But also because my clothing is chosen in a civil cut (one of the reasons why I love Solognac clothing), it looks quite civil if seen in a short distance in forest and field and also if seen in the bakers shop.
And my rucksack is very small, just 34 litres volume. People don't assume that it's possible to squeeze a complete 3 seasons stealth camping equipment into it. Even most experienced bushcrafters aren't able to manage it. And usual people simply don't know that it is possible.
So I just look like a man who is on a day hike. I don't look like a paint ball player or somebody else who likes to play soldier.
I am just a usual Gentleman on a day hike who of course rented a bed and breakfast or hotel room in the next town, like everybody else.
Like this I stay undetected on the way into the woods and if I am already in the woods.
With sunset I put my olive green sleeping and bivvy bag on the olive green or rather dark grey German army folding mat and lay down in the high grass or undergrowth. When I sleep I don't moove and am invisible like this even if I sleep a bit longer and farmers and foresters already start working.
If it's already raining if I set up my camp, I set up my camouflage pattern poncho as a very small tarp roof, pretty low of course and also between some bushes, for example in the corner of two hedges.
If it's raining in the evening it surely will be whet in the morning too, and less people will run around in forest and field.
So, and now I get caught! A farmer accidentally comes, although he usually never leaves his tractor, on foot exactly along where I did put my little camp!
He wouldn't see me from a distance of 50 or even 20 metres, but he nearly stepped right onto me, whyever.
Who gets caught?
A civil clothed man in a green sleeping bag on a green roll mat with a little green rucksack!
Any bottles flying around? Other garbage? Did he do something irresponsible? Any damage? Do they reenact the zombie apocalypse here or WW I, II or III?
-- No, nothing like that.
That's just a Gentleman who slept in the corner of the hedges like a fox. Obviously an old boy scout, nature freak or something like this.
Ah, he is able to wish me a good morning, to apologise that he slept on my ground and to explain that he is hiking from X-town to the railway station in Y-town, during the week a bookkeeper in Z-town and simply does that for recreational reasons and because he wants to watch wild animals in the twilight.
Obviously not the most dangerous criminal in the world...
Even if the farmer doesn't agree, it's unlikely that he calls the police. He will just tell the crazy guy that he should leave his ground now.
But it's quite possible that he has nothing against the guy. Why should he?
I didn't stealth camp in Britain, but everywhere in Germany and France thousands of times. Of course I also was found by farmers and foresters a couple of times, and I never, never got a serious problem with anybody. Nobody became angry about me, because I look civil, I behave civilised and treat the foreign properties and the wild life as responsible as possible.