Dear WB,
I haven't read the Coffin book for many years now, but one thing that stuck was his suggestion that unbleached muslin be used for interfacing. In the time it takes to wash and dry it three times, I can have three shirts completed.
I have developed a very fast, efficient method of shirtmaking. I do all the details first; construct the stand and collar; put in the sleeve vents; press in and sew hems; sew the yokes to the back (inside and outer); sew the fronts to the inside yoke; topstitch the yokes to the outside fronts; attach collar stand to neck; flat fell sleeves to armholes; french seam sleeves and side seams; attach cuffs. Some designs have a separate button band down the front. I would do this step before sewing the yokes. While I can't describe it here, I have a way of attaching the collar that precludes the stand ever hanging over the edge. Putting in the hems before sewing the pieces together assures a smooth french seam over all the layers.
I also seem to recall that the book recommends all cotton fabrics. Since I hate ironing and can't afford to send shirts to the cleaners, I use treated cottons or blends that don't require any more than touch-up ironing. I find it somewhat elitist to refuse modern fabrics.
Teri