First find the side seams that need to be reduced in the legs of jeans.
Second, the first needle goes through the middle of the trousers seam from the inside out.
Third, the second needle passes through the jeans fabric in parallel.
Fourth, the third needle is on the other side of the trousers seam and passes through in parallel.
5. Repeat the above steps to sew one left and one right.
Six, pay attention to the left and right distance is getting wider and wider
Seven, tighten the whole needle and thread.
Eight, the trouser legs of jeans have shrunk.
Nine, finally finish it at the bottom and sew it up.
X. the effect is shown in the figure.