"Your nana's Christmas sweater game ain't got shit on me."
Of course, Vigo didn't randomly stumble onto this technique while collecting clam spit as a hobby. Sea silk is an art form that goes back to Ancient Egypt. It was the finest fabric known in antiquity, coveted not only because it shines like gold when held in daylight, but also because it was said to improve your fortune and fertility. We'll never know what desperate (and suicidal) tailor discovered this disgusting process, but it's so difficult and time-consuming that over the ages, fewer and fewer could be bothered to learn it. Now, only Vigo still raids clam gums for residue to make this soft gold.
Due to sea silk's rarity, as well as how delicate and beautiful it is, she could probably make a trillion dollars selling curtains to Saudi princes. But she and her family actually live on welfare, refusing to sell the cloth at any cost, claiming it would offend God to monetize "the soul of the sea." Instead, she gives it away. But before you submit an order for three yards of the stuff, it's also in incredibly short supply. It takes Vigo 200-300 dives just to gather 200 grams of byssus. So anyone hoping to nestle cozily under a bedspread made of mollusk drool is out of luck.