Regarding the pattern for the scarf:
I think we should be looking for some sort of oriental dragon design.
If you look closely at the new pictures from the trading card, you'll notice the spike-like forms above the "scale-pattern" and these swirl-like lines farther on the right (suspectedly being the "whiskers" or hair of the dragon)
I think this shows a high resemblance to typical dragon-designs like this for example:
Though they might have used an even more stylised design, like paper-cut or linocut:
No perfect match so far, but you'll get the idea. Been already browsing through hundreds of pictures...
It's quite likely, they didn't use the whole image, but just some smaller strip to be turned into the scarf.
Just an idea to narrow down the search.
(I'll also try to improvise a whole design, using the parts we've seen so far).