I have been seriously hunting out of pop up ground blinds the last four years. I have used natural material ground blinds for years and used camo or plaid to hunt out of them. But the pop ups have a black interior and I do believe that unless one is somewhat matched to it, the contrast would be too obvious. I learned about being sky lined in a blind with too many windows open, had a buck spot me very quickly one time. So I use limited openings with one main one to shoot out of. On my property, the wife and I built a 6x8 foot and 7 foot tall ground blind that I lined in black. I actually took the narrow zipper window out of another pop up that bit the dust to make my shooting window. I made this strictly to shoot my longbow out of. Anyways, I wear a black shirt, black mask and black cap. I also wear black coverings on my hands. I also usually have a big aluminum pot that I burn a little bit of wood shavings mixed with some dead leaves. I try to make enough smoke inside to possibly help mask my scent. I have used smoke like this to smoke my clothes as well as me. Actually saw some African anti poachers do this with elephant dung to help with the big predators, seemed like they spent several weeks out in the bush doing their job. I have seen a few people get away with not blacking out on some of the TV hunting shows but those don't always hunt like we do, it is a show. But I also know of a few guys that seem to get away with murder out in the woods. Of course I am trying for 12 yards or less on a shot at eye level.