I was looking for a specific bit of mending technique and misremembered which book it was in, but look at this! Mending, darning and patching instructions straight from the 1920s. There's a couple I haven't much seen anywhere else, especially stoting.
https://archive.org/details/newdressmakerwit00butt/page/146/mode/2up?view=theater
The new dressmaker; with complete and fully illustrated instructions on every point connected with sewing, dressmaking and tailoring, from the actual stitches to the cutting, making, altering, mending, and cleaning of clothes for ladies, misses, girls, children, infants, men and boys : Butterick Publishing Company : Free Download, Borrow, and Streaming : Internet Archive
Third edition.