Use your needles, wool and knitting method: knit a sample cloth and count the needles of the sweater.
Methods: 1 4 needles in1,
2) weaving 5 cm long,
3) measuring the width and length of the woven sample cloth; (2 side needles are not measured)
4) Assume that the bust needs to be 35 cm (the bust size in two-bar knitting);
The whole body needs 35x2: 70 cm (the whole body size in four-bar knitting);
Sample width: 7cm
35cm/7cm x 12 stitches = 60 stitches (that is, knitting with two sticks, the number of stitches in a sweater).
70cm/7cm x 12 stitches = 120 stitches (that is, the stitches of a sweater when knitting four stripes).