I am a gram weenie backpacker, so I did not cover the IX at all. It has a simple draw string footbox.
The top layer is 2-1/4" wider than the bottom to allow the quilt to lay over me in an arc - same concept as an underquilt differential, but opposite. My IX is cut 72" long and the top layer is cut 51.75" wide and the bottom layer is cut 50.75" wide. The finished width of the top layer is 44.25" wide and the bottom layer is 42" wide.
Both top and bottom layers have small folds, 5/8" high when finished (picture 1). These are sewn after pinching the fabric together, running from head to toe, about 7-3/8" apart on the top layer and 7" apart on the bottom layer. The bottom row will begin and end with a half spacing which will be offset the bottom folds from the top row of folds, such that there will be about 3-1/2" +/- spacing between the folds when you put the top and bottom layers together (picture 2). The sewn folds in each layer face the opposite layer, creating the "space" between the layers (picture 3).
I tucked the top hem in to give a smooth edge where it will be next to my face and I created a "box" hem along the sides to give support so that the two layers stayed apart (picture 4). I sewed a piece of silnylon along the bottom hem to create a channel for the drawstring (pictures 5 & 6).
I folded, then rolled the quilt, then wrapped with a piece of velcro (picture 7) to control it while I placed it into the stuff sack I made (picture 8).
I will take it on it's maiden voyage the following weekend on the Florida's Swamp Runners HammockForum hike. Right now the lows are predicted to be in the mid 40's, so I hope to be warm. I'll report the results after that excursion.
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