If I'm just adding to my stash, I try to buy at least 2 yds. If its a neutral or black I buy 5 - 10 yds as it will never go to waste. If I'm working on a pattern I buy what they state and a yard or two more for good measure. If I find a neutral and/or black in backing fabrics I'll buy them instead as you get more for your money. I've found a sateen backing in a few colors and have been buying them as they have such a nice feel and drape to them plus you get more for your money at 108" wide.