Bakers, Caste of (caste) mentioned in the Books. Their caste color is yellow and brown

I stayed for four days in the rooms above the shop of Dina of Turia, there I dyed my hair black and exchanged the robes of the merchant for the yellow and brown tunic of the Bakers to which caste her father and two brothers had belonged. 
Book 4, Nomads: pg 23