Plain Blade Fabric Scissors
Plain blade fabric scissors are universally used in dressmaking and crafts to accommodate cutting through almost all fabric types and weights. While they are design to cut best through medium and heavier weight fabrics, if they are sharp enough, plain blade fabric scissors will perform just as well when cutting flimsy lightweight fabrics.
If you take a closer look at the blade itself, you'll notice that both edges are smooth and sharp. You may notice some slight texture on the blade which provide some grab and stability in the cutting process. This textured structure works similar to how our finger prints work when we handle smooth surface objects. Plain blade fabric scissors do not have distinct ridges. Scissors features these distinct ridges feature a serrated blade which provides enough sharpness and stability to cut through light, sensitive fabrics.
If using plain blade scissors on very sensitive fibers like silk for example, the blade can sometimes pull the fibers inwards resulting in a less smooth cut, even if the blade itself is fairly sharp. It's good practice to pre-test a piece of the fabric with the sharpness of your blade before cutting into the garment's final fabric pieces.
Note: Never use your fabric scissors to cut paper as this will wear out the blade much faster. It is good practice to hav e a separate set of scissors for pattern drafting and craft needs. Even better, if you recently upgraded to a new pair of fabric scissors, you can turn your old pair into your designated paper cutting scissors.