Alternate retainer shapes

The removable (prior to wash/dry) retainer shape might be a good option. Here's another design - two pieces not connected to each other. Also a comparison to yesterday's one where pieces of plastic were sewn together with one of the button-hole stitch settings:

Yesterday's blog entry again - https://fu-cv.blogspot.com/2020/04/experimenting-with-retainers-that-force.html