I'm turning one of Costco (actually Amazon) down throw blankets into an underquilt and was trying to decide the best way to do the suspension. The simple approach is just to sew or tie shock cord to the four corners of the underquilt. The other approach is to sew channels along two edges of the underquilt and run a continuous loop of shock cord through both sides. I had initially assumed that tying off the 4 corners would be just as good, but I have noticed a tendency of the underquilt sides to puff out and gape if I shift around the wrong way. Do the sewn channels work better for underquilts?
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