Roll Hemming a Curve Made Easy, an article by Kenneth King. The way he does it, he stitches a light paper stabilizer into the hem, and it stays there.
Gold shimmery gown v
Roll Hemming a Curve Made Easy - Threads-sew through strips of paper to stabilize the lame fabric--use "solvy" & monofilament thread if working w/translucent fabric
This is not tissue lame, but a heavier type. Most of the other lame I carry is wide, but.