从腰部顶部，沿着边缝剪开。 裁剪并对折一块相配的布料。 把布料别在适当的位置。 沿着牛仔裤边缘，缝之字形针脚。 从里面剪掉多余的布料。

I'm interested in that, but I only have a few mins. Can you give me at most the first 500 characters of a detailed explanation in English about that?
Cut to the top of the yoke in back, which is the v-shape stitched line across the pants between the pockets and the waistband. You'll cut 2 to 3 inches (5.1 to 7.6 cm).  Make sure to cut right along the seam, which is where the pants are stitched together on the side. You'll have a "V" when you stretch the area out slightly. This process will add an extra piece fabric on each side of the waistband, which will make it slightly bigger. Just pick a sturdy fabric in a similar color. You can buy a sm