The garments themselves may be termed "vintage", but their design is based on aesthetic elements that, to my mind, are classics and therefore, timeless.
Vintage Fashion Ideas
Covers styling of the garments; what features are desirable and why.
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 