I think wool is supposed to dye the best from what I remember reading. Had a friend at university do a dye comparison for different textiles as part of her class. Silk does well too, I think? Different fibers react differently to the same dye treatment so you get different color results.

I love that color. One of the teachers had a top done in that color which surprisingly went well with her copper red hair. Drool is unbecoming and hitting her over the head to steal the top is frowned upon. *sighs* WHY?