muslin is what dress makers use to make the mock up dresses. needles for hand work goes in easily. but we tend to wash our quilts.
my vote. not very washable over time. but then. if your piece will not be used as a quilt. sure.
Long arm quilters here have said don't use sheets for the back of quilt.
so, you have a delema. Up to what you will be using your Dear jane for. the Dear Janes are so very much work. I would hate for you to use a fabric as sparce as muslin.
OK.. here is the can, opener and label says WORMS ! Good luck with your topic.
Ell