Often I don’t cinch my underquilts just right and they slip off my shoulder when I move around through the night. Here’s a quick sewing fix that can be done by machine or by hand.
narrow grosgrain ribbon
1 mitten hook
1 cord lock
First I sewed a grosgrain loop to the outside of the Blackbird. I sewed it to bottom side of zipper material where my shoulder usually hits. Then I made a loop of shockcord that has a mitten hook and cord lock attached and tied it to the grosgrain loop on the Blackbird.
Now I only have to add a grosgrain loop to all of my underquilts (also at shoulder) and I can hook the mitten hook to any quilt I have to keep it at the right spot and prevent shoulder slip. My JRB quilt already has a loop for the HH tieouts so no extra sewing on JRBs. The cord lock allows you to tighten or loosen the quilt at the shoulder. And your UQ doesn't have to be placed just perfect or the same each time with a longer piece of shock cord and cord lock. Can loosen when you want to vent the quilt.
See attached pictures. The blue one is a short quilt so shoulder spot is close to end of quilt. Kelly green one is JRB of course.