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

#Mending #OldManuals

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.

Internet Archive

This is the one I was thinking of, from some 20 years prior, and is a pretty good foundation if you like perusing old books:

https://archive.org/details/householdsewing00banngoog/page/n90/mode/2up?view=theater

Household Sewing with Home Dressmaking : Bertha Banner : Free Download, Borrow, and Streaming : Internet Archive

Book digitized by Google from the library of Harvard University and uploaded to the Internet Archive by user tpb.

Internet Archive