I made an UQ out of a poncho liner. I was hoping for a warm weather/in the house UQ. It is just a little too breathable. It is not quit as warm as I wanted. I just ordered 3 yards of IX to line the inside of the poncho liner. My plan is to cut the IX to fit and sew just at the edges. Will that be enough or will I have to attach it in the middle also. I should have a piece left of the IX about 40 X 60 for a second layer that can be used only when needed. I am not sure how I will keep it from moving around. Any suggestion on the whole project?