Many years ago, I was able to take a class at Pennsic from Richard Wymarc. The Notes are long gone, however if I recall, the class was an introduction to the style of German Brick stitch embroidery work. Took to the internet to find his website to find the site and hopefully patterns. Much to my delight, the site is still available, complete with the chart I remember from the class, as well as a slew of many other charted period items to choose from. The website where the pattern that was used for this projects came from: Wymarc.com.
Mine is worked in cotton floss on a 28 count cotton even weave ground. Looking forward to the next one. Which will be done using silk for the embroidery, on an even weave linen ground.