[oderfa]

I would also recommend you a webtex concealment vest or some copy of that(MFH). I have used a ghillie that is built on that vest and I love it. Easy to put on/take of and doesn't restrict your movement too much.
But if ghillies are total no go, russian sumrak could be a good choice. I just bought one and it seems to be pretty perfect for sniping since it is very loose and has some loops on the shoulders so you can attach a little vegetation on it. Haven't used it yet because of the winter but so far so good.