You do not need a ghillie suit to stalk., You don't even need camo, just a dark subdued material like olive drab. In my experience the number one thing that will give you away is movement. Don't be paranoid about movement, however, just remember that in nature, the wind blows and leaves and small branches move -- but not too much and not too suddenly.
Secondly, I would say white skin is your next biggest problem. Even if you are dark skinned, you still show up, particularly if sweating. You will glisten in the light. Cover up the skin. (just look at the two guys in the pic.) The white arms and faces are what you see first. The camo shirt is completely negated in the pic, by the white skin. Wear a long sleeved shirt, better in the woods anyway. Avoid shorts, (more white skin).
I don't know about in the U.K., but here in the states, you can buy baseball type caps with a built in sniper veil. They are sold for turkey hunting. You have got to cover up that face. You don't need to cut eye holes in the veil, just look through it. It seems odd at first but you get used to it quickly.
Up close animals see your eyes, remember they are partly white and they are wet and glisten. Almost all predators have large eyes. Animals are always watchful for eyes and large eyes in particular. I like to wear sunglasses to hide my eyes.
Animals will smell you. They will smell your natural odor, and they will smell soap, cologne, after-shave, etc. There are soaps available that will cancel out human odor. (for you and also for your clothes) If you don't have them, crush some local vegatation up that has a fairly strong smell and rub it on you and your clothing. Use that to hide your odor. Don't over do it.
Stalk into the wind. and last but not least, absolutely refrain from talking.
Don't panic if you accidently make a loud noise, such as, stepping on a stick and hearing a loud snap. The woods are filled with noises. It just can't be too loud or sound out of place.
When you walk, take two or three slow steps, and pause for a while. Search the woods ahead of you during the pauses. If you are in a hurry, don't even think about stalking.
Watch where your shadow is located, it can give you away. (you may be hid but your shadow is moving along the ground in plain sight.)
Just remember, animals are very wary and often have excellent senses of smell, vision and hearing. But conversely, they do not have supernatural powers and can be walked up on fairly easily at time. Also, they are generally either eating or looking for food, so they have things on their minds just like us.
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