The Wal-Mart that I buy fabric from always adds a few extra inches to every cut. Often, if there's less than a yard left on the bolt they just throw it in free. However, one LQS I go to they generally ALL cut it 1/2" or so over the requested size, so it's obvious that they've all been trained to do that. At another LQS, they ALL cut it EXACTLY at the requested size, no overage. So frequently, I get shorted a bit there.