blouse cutting mark formula|part-1

Size neck/ shoulder
28-32. 2.5/2
34-38. 3/2.5
40-44. 3.5/3
46-50. 4/3.5
Full shoulder measurement
Chest round inches 28-30. 30-32 34 36 38 40 42 44 above 44
Full shoulder 13 13.5 14 14.5 15 15.5 16 16.5 17