My cousin's daughter celebrated her 25th birthday with a Bob's Burgers themed party and my cousin commissioned me to help him with his costume: BEEFSQUATCH! (Season2:Episode 9) I made the burger, he bought the mask, chucks, etc.
I had a lot of fun with it, but it was a little stressful because I live in Montana, he's living in California for work, and his daughter lives in Seattle. So no fittings and because of time limitations, size, and shipping cost, I shipped it directly to Seattle and he didn't even get to see it (in person) until early morning the day of the party!
The burger deets:
The bun exterior is a spray painted, egg crate mattress pad, with the backside facing out.
Side with all the garnishes:
The bun interior and lettuce are woven cotton, the ketchup is cotton blend jersey, the cheese is marine vinyl, and the burger is polar fleece.
Close up of the sesame seeds which are beads I made with polymer clay and then painted and sewed on.
You can see that there ended up being a decent range of motion!