Okay, I found some pics of the Canadian Muppets from SESAME PARK, they're apparently on display in a museum, and there's something that stuck me as curious, I'm hoping some of the pro puppet builders here can help me out with; check out these two photos in particular, given how clear cut they are: Is that actually jersey (t-shirt) they used to fabricate her mouth? And what about the tongue? Do most Muppets have jersey inside their mouths like that? To be honest, I've seen jersey used before to fabricate entire puppets, but it's usually for those kinds of generic, store-bought, stock puppets. If jersey is a common/acceptable material for mouthplates, I may happily make the switch: I've often used felt, but felt tends to be a thicker fabric, and when you pile on the throat and the tongue (also felt), that obviously affects how well you can close the mouth when performing.