As I ponder further which thread to use on my coif, last night I finished up the first vine coil of Plaited Braid Stitch. It took 4.38M of the #4 Gold Passing thread, and took 3.5 hours of time (including the rose center and the rosebud stem.)
Thistle Thread Blog instructions for Plaited Braid Stitch start here, but previous posts have good info too.
You Tube video on the Plaited Braid Stitch
Calico Crossroads Plaited Braid Stitch Tutorial for $6- worth it if the others leave you scratching your head.