Most of my outdoorsy stuff involves cycling and camping. I'd always go for synthetic fabrics (and no, I don't mean the day-glow lycra stuff). I get a lot of stuff from Decathlon, but always steer clear of cotton, as it takes too long to dry. The Decathon stuff is really good, cheap, comfortable, and most of all, normal looking.
I second Decathlon - I have a dark grey waterproof from there, paid about £25 so I don't mind if I end up scrambling through brambles, and I also bought a pair of Geologic fishing/outdoors trousers in green, £15.
I would certainly steer clear of the Real Tree and too much DPM - it just tends to give the wrong impressions to landowners and members of the public. I do use DPM pouches on my belt, and that was purely a cost thing. At the time I could get WebTex or Brit-issue pouches for about a quarter of the price of green or black
Personally I like Snugpak for bags, but then again I got into Snugpak when I was doing a little third-party work for them, so got a couple at cost. I know that a few people on here have issues with Snugpak sleeping bags (I think it's sleeping bags) but I've only ever had one split on a bag and that was my own stupidity.
I've found that as long as you aren't wearing really bright clothes, you still get to see all of the wildlife that the woods has to offer - you just have to blend in to a degree, you don't have to blend in to the point where even a soldier can't spot you