I am currently piecing together a plague doctor costume from Season of the Witch. I can't for the life of me figure out what the white outer robe they wear is called. I don't think it's a cloak since it has sleeves, but I wouldn't call it a gown because it's open. Same with their undergarments. The white directly on top of the black looks like a pretty standard surcoat with a pocket sewn in and straps sewn onto the sides. The black outfit underneath looks like a priest robe, but I'm not sure.
If you know what these articles are actually called, please let me know! Even better if you have a source for patterns or close to patterns/garments.
Included are some screen grabs.
Thanks for any help!