I was looking for photographs of Middle Byzantine brooches for the costume I'm planning when I came across an interesting website called Maestra Anya's Big Blog of Medieval Miscellany. One of the older posts was about physicians' costume in Byzantium. It includes pictures from period illuminated manuscripts. Apparently physicians in Byzantium, at least during the late medieval period, customarily wore blue, or blue-green robes. I find this sort of detail fascinating. Maestra Anya's blog includes posts about other interesting items and facts; I recommend that any reader interested in the Middle Ages check it out.
EDIT: to correct my misstatement about the time period from which the illustrations featured in Maestra Anya's post originate.
EDIT: to correct my misstatement about the time period from which the illustrations featured in Maestra Anya's post originate.