Sewing is a dialect saying, which means the same as sewing and sewing, that is, sewing the edges of clothes with a sewing machine to prevent the cut cloth from coming loose. There are also some dialects called code edge and copy edge. Clothing factories basically talk about sewing, and some clothing books are about sewing.
If you want to distinguish, it is better to call it sewing. The package is wrapped with another piece of cloth and sewn with thread. There is also a flat seam, which must be sewn with thread on the sewing machine.