First, prepare a line. This is not an ordinary thread for sewing, but a thick and elastic elastic thread, which is sold in shops.
Then, prepare another injection. This is not an ordinary sewing needle, the pinhole is large, and a needle with a particularly thick thread can be inserted.
Now let's thread the elastic thread into the pinhole. The elastic thread has a rubber band inside and a layer of thread outside, which has burrs. It's hard to wear in a pinhole. Here's a tip: Fold the elastic thread and insert it into the pinhole, which will become very easy. Then pull it into a double heel line, so that the tension is relatively large and the length is left as needed.
Next, thread the needle and thread through the thread sleeve at the edge of the neckline. Don't drop every thread sleeve, and smooth it as you wear it. Tie the two wires together after winding once. Then, pull it again to make it more elastic.
Now look at the effect after the change: the neckline has been reduced from 8 inches to 6 inches, tightened by 2 inches, and the entire neckline circumference has been reduced by 4 inches.
The collar and cuffs of sweaters will be exaggerated if they are worn for a long time or because of improper washing, so we can decorate them with tips and make them easily.