How to Cut Fabric Without a Rotary Cutter The easiest way to cut fabric in a straight line is with a rotary cutter. No question! But, I do not recommend children using a rotary cutter. Also, if you are new to the sewing scene, you may not have invested in a rotary cutter, mat, and ruler set yet. So if you do not have one, (or should not use one) there are other ways to cut a fabric in a straight line. The Lost Apron