This time the lesson comes to us from McCall Style News November 1946 flyer.
The topic is saddle stitching which we see so much of in vintage sewing patterns. Here's the blown up text.
And here's another lovely image from the 24 page flyer, the drop-dead gorgeous McCall 6686.
Also something you might be interested in is Short Cuts to Sewing Success - 1944 - By DuBarry Patterns.
I have a copy and it's fantastic, and there's one for sale on etsy right now for a good price.