Viscose material is a synthetic fiber created by the English chemist Charles Frederick Cross and his collaborators, Edward John Bevan and Clayton Beadle, in 1894 and known form that day as artificial silk.
This is not your hat, as Magritte would say.
It's similar, sure, but it's not the same. Because your hat, the one you're buying, will be made expressly for you immediately after your purchase. It will be a unique artwork.
Delivery will take more or less time depending on the creative and development process.