While attempting a rolled hem in the sheer above, I kept having problems with the rolled hem perforating and breaking away from the fabric. I tried a variety of stitch lengths and density, but the problem continued.
So I laid the hem along a length of fusible webbing tape as I serged the rolled edge so that about half the tape was cut away and the other half lay under the rolled hem. It was able to grab hold of the webbing and the hem no longer pulled away from the dress skirt. I then pressed the hem (low setting) and the webbing fused the hem even more securely.