Dyeing wool, cloth or a garment with natural dyes is not as easy as it is with procion or other chemical dyes. There are many steps involved before the dye pot is even mixed.
To begin with, not all fibres are the same. Some such as cotton and rayon are derived from plant or cellulose sources, while wool and silk are sourced from animal or protein sources. Cellulose and protein fibres must be pre-treated, handled, dyed and washed differently.
In order for fibres to accept dyes, they must be scoured (cleaned thoroughly to remove any sizing or oils left over from manufacturing), and mordanted, that is treated with a substance such as alum to allow the dye to bond with the fabric. In the case of cellulose fibres, a tannin must be introduced to the fibres before the mordanting process, to allow the mordant to adhere (which in turn will allow the dye to adhere).
Each of our naturally dyed garments has been treated with at least 2 processes, by hand, before the dye pot; as well, some of the better natural, ethically sourced dyestuffs can be more costly than procion or other chemical dyes. As a result the finished products can cost more than some of our other items. We would argue that the natural beauty of the dyes and the environmentally friendly processes are more than worth it.