I've tried a silk sleeping bag liner in my hammock. I just ended up with a mess because I would toss about a couple of times before slipping off to sleep and the silk just seemed to wad up to one side. I'm thinking about taking it apart or spliting the seam that goes half way up the side and making it into more of a flat type sheet. I do like the weight of it and when I can keep it on me, it does provide warmth and wicks away moisture. I might even see if I can attach it some how to my summer down quilt.
On another note, I just found a used military poncho liner that I'm gonna see how well it works for an under quilt and for just sitting around the camp site as a quilt. Love the camo colors.