Metal Gear Solid 3: Snake Eater/Camouflage

Camouflage
There is a wide variety of camo patterns you can wear in MGS3. Each one affects your "camo index" - a percentage displayed in the upper-right portion of your screen that determines how difficult it is for the enemy to spot you. It's common sense to wear camo that blends in with the environment.

Naked
Selecting this camo will remove the upper part of Snake's uniform. Only use this if you're confident in your sneaking skills (and have a lot of food - because your stamina will deplete faster while naked). No, there is no way to take off your pants, as Sigint will attest if you call him while wearing this.

Olive Drab
The most basic uniform, a solid green color. This is somewhat useful indoors, but there is little point elsewhere.

Leaf
Forest camo, designed to blend in with tall grass and bushes. You'll be using this a lot outdoors.

Scientist
This is a Russian scientist uniform from the Graniny Gorki weapons lab. Use this to get around Graniny Gorki without alarming the guards (though the scientists will still run for alarm panels if you get too close to them). Press Triangle while wearing this to adjust your glasses.

Major's Uniform
(I can't remember what the game refers to this as.) This is the uniform that you steal from Raikov in Groznyj Grad. Wear this in combination with the Mask (under Face Paint) to disguise yourself as Raikov and walk around Groznyj Grad without being spotted. Press Triangle while wearing this to salute (which the guards will respond to by saluting back).

Camouflage - Subsistence Only
These special camo patterns are only available if you're playing MGS3: Subsistence.

Desert Tiger
Like its name implies, this is a tiger-stripe outfit in a desert color scheme. It is also effective in wooded areas. As an added bonus, wearing this camo prevents attached suppressors from wearing out.

Flecktarn
This is a more advanced woodland camo, bringing your index up into the 90's - even if you're crawling in the open. However, it doesn't work too well in dirt, bark, or indoors. This camouflage prevents your battery from draining.

Facepaint
The right camo pattern is only half of the equation. A bare face can be a dead giveaway, so it's important to conceal your face with a wide variety of different paints.

No Paint
Selecting this will remove the paint from your face. There's not much point to doing this, but it might add a bit of credibility if you're wearing the Scientist disguise.

Woodland
This paint works best in conjunction with the Leaf or Flecktarn outfits.

Mask
You start the game with this mask (and it's also shown in the introduction cutscene, if you selected "I Like MGS2!" when starting the game). The mask looks a lot like Raiden from MGS2 (actually, it was designed after a Russian commander - Major Ivan Raidenovich Raikov). Wear this with Raikov's uniform to disguise yourself as him.

Facepaint - Subsistence Only
These facepaints are only available if you're playing MGS3: Subsistence.

Germany
This facepaint looks just like the German flag.

Italy
This one looks like the Italian flag, and for some reason, also works well in wooded environments.