In our small-medium online store, our practice is to give at least an extra inch on each yard and at least an extra 1/2 inch on each half-yard. We use precision rotary cutting with a locked t-square system to make sure our cuts are as straight as possible but the fabric isn't always rolled straight on the bolts. So the extra inch is sufficient in most cases to compensate for that and any ruler wiggle there might be. If it's really cockeyed on the bolt, we have to do more work to keep it straight. We also try to inspect every piece of fabric that goes out for any flaws. We end up cutting out a lot of flaws in the fabric on some fabrics, so this is a big expense as well.
It takes longer to cut precisely, and it costs a lot to include extra inches, but we feel it's worth it in customer satisfaction.
Chain stores that have employees tend to stress giving exact amounts, because they are watching every penny and are accountable to the owners and/or stockholders.
Being the owner has it's advantages. :mrgreen: :mrgreen: