Steve Ski, Adrian, Samson, Wayne and Malc thank you very much for your kind words.
Samson, gosh, I pick up information from a wide collection of sources. Fabric creation, dyeing and process information come from a variety of searches and generally are described within material craft sites. I also gleaned a great amount of information from the book by Daniel Hohrath, The Uniforms of the Prussian Army under Frederick the Great.
It has samples of cloth from the time which is useful to see the colours and weaves of the textiles used (boy were they rough for the common soldier). It was an expensive book but for me worth it.
Melanie