I recently made a 3/4 length IX underquilt, and I'm having trouble keeping it in place while sleeping/tossing and turning. I am using it in the Warbonnet Blackbird. I don't have time to test it out again before a big trip, so I need to modify it blind.
The UQ is a basic rectangle with a couple pleats on the short ends. It's three layers of IX with a nylon layer on the outside. I have channels on all four sides, but there's nothing in them yet. I sewed on six grosgrain loops: one on each corner, and one in the center of each short side.
I used it over the weekend by attaching it to the hammock with shock cord and micro-biners on all four corners.
It seemed to be working fine, but I'm a side sleeper, and each time I would switch sides, the UQ would slide away from the left/door side of the WBBB. I could open up the zipper and pull it up, but it wouldn't stay there for long. I also got a cold spot near my neck where I think the top short edge was gaping. The coldest temp of the night was around freezing (32 degrees).
Any advice about what I could add to keep it in place?
Would running shock cord through the channels on the long sides do it?
Should I use one long piece of shock cord through the long sides that doubles as the suspension?
Any thoughts are appreciated.