Here is a free ebook offered by Interweave on Pastel Painting. The techniques and processes he describes can be used on fabric! While he is using pastels, the color theory and layering he describes could be used with water-soluable pencils or crayons too I think. Just remember:
- The pastels must be chalk or water-soluble. Regular pastels have an oil base that will repel the bonding liquid. If you use a regular pastel, it will wash out.
- Take care with the layering that it is not so heavy as to block the bonding liquid from actually wetting the fabric. That is needed for the bonding to occur. It is possible to wet with the bonding liquid after each layer, let dry, and then add the next color layer if needed.
- Use a bonding fluid such as base extender, 50/50 glue and water, acrylic media, etc.
- IRON it to heat set it.