by Butterick Pattern Company, The New Dressmaker (1921)
“ SLIP-STITCHING is used when invisible sewing is required for holding hems, facings, trimmings, etc. It is not a strong sewing, but it is one of the most valuable stitches for finishing work in silk or wool. In this stitch it is necessary to take up only part of the thread in the material. This is what makes it invisible on the right side. The stitches should be taken as far apart as will hold the edge in place. Let the needle slip through the under side of the fold of the hem between the stitches and bring it out through the crease of the fold. ”
