Historically, herbal dyes were used for most domestic clothing. Dyes created at home were often not very colorfast, so overdyeing and redyeing was normal
How to dye clothes at home – naturally
Looking for a 1000-year-old blue
The Toxic History of Color
Medieval Dyes and Dyeing
Natural Dye Colors: The History of Natural Dyes – Pure Elegance
shades of urth… – explorations into plant dyes
How To Dye Cotton With Black Beans (No Mordant) - Sew Historically
how to choose) Viking age colours
Medieval Clothing and Fabrics in the Middle Ages
Woad, Celts and Picts - The Way of Witch
Natural Dyes: Use in Large-Scale Companies - Yana Dobreva
Wearing Woad - Clothing ourselves beautifully
history of dyeplants
Colour dyes: a (very) short history of dyes from around the world
The History of Indigo Dyeing and How It Changed the World