Play through the game a few times on the same save fileand get dog tags.
You can get dog tags by holding up a soldier who has one and aiming at their head. The ones who refuse; just shoot them in the arm or between their legs to "convince" them. If you equip the camera/scope and hold triangle, you can see the names of the guards whose dog tags you have. It takes about 3+ playthroughs on different difficulties to get it.
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get all dog tags
Do not fail in the torture sequence...when you beat the game and start a new one the stealth camo shld be in raiden's inventory
my official guide says that you have to obtain the big boss emblem
There are two different ways to obtain the Stealth Camouflage in Metal Gear Solid 3: Snake Eater or Subsistence (doesn't matter which one). 1) Shoot all the Kerotans (frogs) I don't recommend this one. Although less time consuming, finding all these can be difficult as they blend in with the environment. And some are difficult to hit. Like when EVA and Snake are riding on the motorcycle. 2) No Alerts This one is by far easier. You have infinite saves and can restart anytime you want. Hardest place to sneak is Escaping Grozny Grad.
If you play dead while wearing the corpse camo in Metal Gear Solid 4, then PMC troops and other enemies like unmanned weapons will actually think Snake is dead. So when the enemies come to check you out after you've begun playing dead, they'll look you over and say something like "enemy death confirmed," and then walk away and leave you alone.