What is deadstock fabric?

Deadstock is the textile industry's surplus: ends of rolls, over-orders, and fabric from collections that have been discontinued. It was made to be used, and then wasn't.
It exists because of how the industry buys. A mill runs a minimum length; a brand orders more than it needs; a season closes and the remainder has nowhere to go. What's left is often very good cloth — heavyweight upholstery jacquards, ribbed velvets, woven geometrics — sitting in a warehouse with no order attached to it.
SISU buys from EU-based suppliers who collect and resell it, among them Wasted Fabrics, EVA re-source and Fabric Sight. Nothing is woven for us. Everything already exists.
The consequence is that quantities are fixed before we start. A roll might yield six cushions, or eleven. When it is used up, that is the end of it — there is no reorder, because there was never a first order.
So when a design says it won't be restocked, that isn't a sales tactic. It's a description of the material.