I recently used my hammock for the first tinme in colder weather. I used a thermarest in my sleeping bag, but my sidfes weer still cold where the hammock closed up around me. Ive been looking at underblankets, but there very expensive. I am about to inherit an old parachute, which i am assuming will be silk, its a little damaged and I dont palan on jumping from many planjes, so i was wondering whether it could be used to make a shell for an underblanket, thsi could be fuilled eitehr with down or synthetic stuff or even with a good duvet. Anyone tried this or thought about it, Im nopt sure of the qualities of silk for this, woudl i be better putting a waterproorf layer over the outside of it?