The garments themselves may be termed "vintage", but their design is based on aesthetic elements that, to my mind, are classics and therefore, timeless.
What Edwardians Knew About Aging and Gluten
A few pointers on the link between longevity and food from an illustrated 1907 article.
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 