The Headpiece is a combination of repainted rubber snakes and 4 sculpted Fimo polymer clay snakes (the front snakes). Everything painted in acrylics. The snake fangs are also made in Fimo, and painted and coated with nail polish.
See the entire costume here: [link] See a close-up photo of the jacket here: [link]
The 1st time it was enough to just stuff them on, as they are quite tight and made perfectly to match my teeth. But as I took them on and off, it started loosing the grip, so I eventually glued them on. Which made them stay there quite nice, and yet is easy to take off again.
Painting all the rubber snakes took quite a few hours, I'd say about 10 hours painting with a lot of waiting for things to dry. Sculpting the front snakes took about the same amount of time, painting them about the same, and then making everything fit right, re-attaching the de-attached snakes and ensuring them took about another many hours. In short - a couple of days. Ish. And thank you!