I don't use a true ghillie, I do often use one of a couple camo 3D type long parka's. I like the 3D parka's alot as they do seem to break up one's outline more so than regular camo wear. I beleive the 3D allows just a little more movement, say to ease the rifle into position, than regular clothing. Especially if the wind is blowing a bit. I think if you use the SEARCH feature you'll find quite a bit of discussion regarding ghillie's. The main thing is movement. Many times I wear drab colored Carhart clothing or something similar, and really as long as you aren't moving too much or at the wrong time, that's generally good enough.