Shiny Puffer-wise, I love the sound of this hooded shiny puffer/bubble coat, and I wish I knew where to get one. It is not nylon or polyester (shiny nylon and shiny polyester do not sound like this). I think it is either 100% PVC or 100% PU (PU blended with spandex or polyester does not make this lovely creaking and crackling noise)
https://www.youtube.com/watch?v=__CGjKETAjs
PVC raincoat-wise, I really enjoy, from a PVC fetish standpoint, the rustling noise made by this 'older' PVC U Like jelly jacket (I say 'older' because the product code on the label is JJ1). I hope PUL keep using the same PVC formula, because it ticks all the boxes in terms of noise, softness, and that 'new PVC aroma'.
https://www.youtube.com/watch?v=6DK8RFv1rCQ&t=26s
Several layers (2, 3 or 4) of the 'sticky' glass clear PVC material magnifies or enhances the crackling and rustling noise:
https://www.youtube.com/watch?v=Zm6VT3leIhg