The garments themselves may be termed "vintage", but their design is based on aesthetic elements that, to my mind, are classics and therefore, timeless.
DIY
do-it-yourself
Resources for Pattern Drafting, Sewing, and Embellishments
I always find something to be gleaned from the combined experience of the curators, seamstresses, needleworkers and stylists who came before me, and this list of books and other resources are a good example.
Sewing Vintage & Illustrated Stories 