Many moons ago, when I did my Fashion & Fabrics A Level, I used some sort of fabric stabiliser that I could draw my embroidery pattern onto, stitch over the top of, and then dissolve under running water.
I used it at the time for some bead/embroidery work, & saw it somewhere over the last day or two at some point but didn't pay attention - just vaguely thought it might come in handy at some point.
Obviously, now I want some for a project
Any idea what it might be called?