1. The invisible needle can make the collar of the sweater look good as always. Let's tighten the collar of the sweater first, and then sew it on the inside with the same color needle and thread. This method is also called invisible needle walking, which is not too abrupt and the overall effect is as good as ever. 2, ribbon insertion method If the sweater is a thick sweater, it is more suitable for this method. We can insert a beautiful ribbon along the collar of the sweater, and then tie the ribbon tightly to make a beautiful bow, which is not only more foreign, but also very sweet and lovely, and at the same time, it can make the neckline of the sweater smaller, killing two birds with one stone. 3. Fold the extra neckline with a pin, and then tie it inside the neckline with a pin. Very simple and convenient, suitable for quickly lowering the neckline of sweaters. 4. Fold the extra collar with clothes, then sew it with needle and thread, and finally cover the sewing marks with clothes. 5, the method of modifying the neckline If it is originally a round neckline, after the neckline becomes larger, we can cut it along the direction of the neckline, and then make the neckline into a beautiful V-neck, which is not only more beautiful and generous, but also better avoids the problem of the neckline becoming larger.