How to lengthen a sweater when it is short?

Pull by hand, the sweater is very loose. Go to the tailor's shop to splice it. This sweater is made of different sweater materials, which is very fashionable! I can knit my own sweater. I can take it down and weave it again. If not, I can find someone to spend some money on hand knitting.

1, start knitting 35 stitches from the back (front), then return to knitting 39 stitches (back) and then return to knitting 43 stitches (4 stitches on each side, that is, 4 stitches more than the previous row). Don't forget to add stitches (now there are 4 stitches in this row). Repeat this process until the sleeves are knitted with 20 stitches. When I knitted the front piece, I sewed 2 stitches on each side (instead of 4 stitches). Now the front piece and the back piece should have the same number of stitches. You can knit in circles until there is about 1 inch left in the middle of the front piece (if you knit a round neck cardigan, you won't knit in circles), and the front piece has been knitted.