The workers of the castle of Guédelon are dressed in tunics and tabards of medieval inspiration woven, spun, and dyed in the workshops of the construction site. The spindle-spun wool comes from the site's sheep, while the mainly vegetable dyes are made from madder, woad, dyers' broom, or elderberry. Weaving looms with a wooden frame equipped with a turnstile tensioning system placed between the two uprights of a fathom were made thanks to the scientific documentation available on the Middle Ages. They make it possible to weave wool but also hemp and linen.