Dungeons and Dragons has defined many fantastic and interesting metals (mythril, adamantine…) and leathers (dragon scales, Leather golem armour…). The lore also likes to call out food and drink as local specialty trade goods (Knucklehead Trout in Icewind Dale, or Crumblecake in Red Larch). It seems, however, that there are very few signature fabrics, like fancy silks or wools. I am not specifically looking for magical items or special effects, or any real game effect at all really.
What high end, fantastical materials for clothing exist in the lore of the Forgotten Realms?
I am currently running a game for a player who plays a weaver, and is looking for an interesting material to weave into a scarf for purely RP reasons. I can easily handwave Giant Spider Silk or Unicorn Hair, but I would be very interested to know about actual in-lore materials. The party is currently near Yartar, which has a bustling fashion and textile industry, so I can handwave that VERY exotic materials are imported at high cost, or sold on the black market.