The book Pants: How to do your own measuring, pattern drafting, fabric selection, cutting, and sewing for a perfect fit by Anna Romaniuk and Ellen Knight (1974) is available as free download through the Perfect Nose blog. If you’re interested you can find it here.
The book (pdf format) is 58 pages and sections included are: The pattern draft; Layout and cutting procedures; Sewing techniques; and Pant fabrics. Step-by-step instructions for each section.
Here’s the table of contents and a preview:
