I modeled the mask off of a gas mask, using cast material and acrylic paint. The glasses are leather, and the inside has foam padding. I also made the dress and the rest of his costume. Pretty much everything other than the necklace and the incense holder. Lots of makeup on me to make me look ill, it looked good in person, in the photos kinda like I am bruised.
We had so much fun dressed up there, even though only a couple of people knew what we were supposed to be. Most people thought we were Spy vs. Spy and a Crack Head.
For those of you who don't know about plague doctors: http://en.wikipedia.org/wiki/Consequences_of_the_Black_Death#Other_effects