Knit from bottom to top, add needles while knitting, add them to the position of the upper edge of the pocket, stop adding needles and knit all the way up.
Sleeve stripes or sewing after knitting are the same as normal knitted sweaters, but the number of stitches is exaggerated.
The thread, stitches and stitches of this dress are exaggerated, which leads to this effect. Actually, it's easy to knit, and it can be done in a day or two.