For example, bust 88, which is the measured full bust. When we proofing, we only print 1/4 pieces for the front piece (a garment consists of 4 pieces, two front pieces and two back pieces are symmetrical), so we need 88/4=22.
The cardinal number at the back is+1, and the general front bust is+1, which is 23. If you divide your body into two halves, you will find that the front bust of a woman is more prominent than the back bust, so the front bust should be+1, but if the front bust is+1, the whole size will increase by 2CM after completion.
But not all clothes have a cardinal number of addition and subtraction. There are not many men's clothes, especially loose clothes. Just 88/4 is enough, and so is the back film. It depends on the style of proofing, as long as the overall size remains 88 after the overall completion.
Similarly, if the bust size is 44.5, the formula is 44/2, and the result is 22, which is very flexible.