I agree, the bigger the piece you start off with, the longer your strips will be, which means less strips and less sewing them together. It also depends on how wide you need your fabric to be to fit your cording. If you only need 75″, that’s just over 2 yards, which really isn’t that long. I think when I make my own bias tape, a couple of inches wide, I can get over 3 yards from fat quarter which is 18″ X 22″. But I did find this chart which gives you calculations for 1 yard of fabric and they suggest cutting strips 3 3/4″ width of 3/4″ cording. They’re saying out of a yard you can expect to get 10 yards out of 45″ width fabric, which is way more than you need. The chart I found is here: http://www.stonemountainfabric.com/sewing-help-bias-tape.htm