A dark thread, a dull thread, a shiny thread and a metal thread are all required for creating Doublet. This is a truly unique stitch.
Stitch the large yellow crosses in your dark thread. This is the foundation. Next, you will use a dull thread to make the red vertical and horizontal lines on the graph. Use a shiny thread for the green diagonal lines and a metal for Detached Chain. You have now completed Doublet.
This stitch is best used as an all-over pattern, or in a sampler.