Selvedge(sel-veh-j)

The word selvedge or selvage is the self-finished edge of fabric.

To prevent the edge of a woven fabric from fraying.

How to check the csv in fabric stage

The grain line arrow is to be placed parallel to the selvedge. Measure the end of the line to the selvedge, pin. Then make sure the other end of the arrow is the same distance from the selvedge and pin. This process is extremely important. If your garment is not cut 'on the grain', it wont hang properly, it won't be comfortable - you'll always feel 'off' when wearing it, but you won't know why, so you just won't wear it.

Never skip this step of laying out your pattern, and never eyeball it. Measure it.