I am pondering making an Underquilt from an old Marmot water resistant down mummy sleeping bag I found at a tag sale. Has anyone tried this successfully? I am thinking to sew first and cut later in order to control the filling, turn the edges to finish, then stitch a ribbon of nylon binding along the edges to run a shock cord through. Would love to hear about trial and error by others before I start. Could also use some advice on measurements. Thanks all.
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