I use 4×6 cards to track my fabric stash. Each card corresponds to one hank of fabric and allows me to see if I have enough fabric for a project without having to actually pull the fabric out. I record the fiber content, weight, color, yardage and (if I remember) how much I paid for it originally. I also staple a fabric sample to the card. As I use fabric I update the yardage to the new measurements. If I use all of a fabric then I throw away the card.