Well, it all depends. If you are planning on it for deer, I'd use some strips of orange construction tape.
I have one from the military, I made it, and it is hot and a hassle. But it does look cool I guess, and it does work very well against other people. But animals, they sense movement more than anything else. And animals can see in color, just not like us, I'm not sure there is an animal that sees only in B/W. They also can sense movement much faster.
Ever watch a new HD tv and see a scene in a movie where the camera pans and the image looks fuzzy and like it is moving funny? That is because you can detect how fast the image is being displayed, with dogs, these televisions look like a blur. They actually make ones now that dogs can watch. See, the first ones were 60hz, which is faster than you "techincally" can see changes in the movement of the images. But in reality, it didn't work out that way, so we have 120hz now. BTW, some people don't notice the fuzzy jumping images --seems 60hz was right on the line.
The colors they see and how they see them has to do with the ratio of color receptors in the eyes, but it is all tuned to their ability to track movement, it complements it. You say you moved and it saw you instantly. That is how they are tuned, they can detect movement much finer than we can.
What a ghillie suit does is to break up an image, forget about the color. The animal also knows the difference between a person and another deer, much like you do. So looking like a bush can help, but a moving bush? Just as suspect to the deer as it is to you. If you are moving out of context to the environment, that is a red flag to them too.
When using a ghillie suit, you want to use as much of the local vegetation as you can, the millions of yards of hand untwised jute and burlap, that just breaks up your image so you look more like a yehti than a man. Military ones are made so you can crawl, the front is reinforced and has no burlap. They'll snag, but just keep on keeping on. The gucci-flage made for hunters, that would probably work as long as it has netting so you can stuff vegetation in it, and it won't take forever and a week to make.
I grew up stalking, I never used a suit back then I had to do it in blue jeans and a t shirt, and spent many hours laying in one spot. If I still hunted, if I needed to for food, I'd use it today, but I'm content on just sneaking up on them and getting a good look.
And for all the stuff they sell and make for hunting today, the skill of the stalk is being lost. I learned from family who learned from family who were the native population of this country before white men showed up. The crux of it all has to do with movement and sound --if you can lay still and walk through the woods without sounding like a human, you can nearly walk right up on them. And I've done that too. My grandmother, she could sit so still she'd get birds to land on her (she loved bird watching). I almost petted a black tail deer until either my heart was beating so fast it heard that or the rest of my unit crashing through the woods ran it off. They can't see you when you are right in front of them, and if you aren't moving? You might as well be invisible.
Smell is an issue, but there are ways of dealing with smell. The best, and most perfect, is to be downwind. So a ghillie suit can help, but it isn't going to make much difference if you don't master the fundamentals of the stalk.
It also goes over my waders so they don't stick out. My lighter waders aren't camo and will shine if wet. It really works out there in the salt marsh. Duck hunting has more requirement for concealment than does deer hunting and there are no blinds out there on the public marsh, so one must blend. 
