The label of the neckline is usually sewn separately. You can slowly remove the seam with small scissors, so that the label can be removed without damaging the clothes.

The label on the waist of clothes is usually sewn together with sewing machine, and the seam cannot be removed, otherwise the seam on the waist of clothes will be broken and can only be cut off at the top of the seam.

Or go to a custom clothing store and buy a "thread remover" or a gadget called "thread remover". When in use, use the sharp needle of the thread remover to pick up the suture, and then use the sharp blade of the U-shaped part to cut it.