Abstract: A Korean-style woman jacket design method is used in producing a jacket well-fitted to a woman with big breasts. The method includes the steps of: determining a back cover width L1 to be equal to one quarter of an armpit-passing chest girth plus n cm; determining a chest cover width L2 to be equal to one quarter of a nipple-passing chest girth plus m cm; determining a collar-back dimension L3 to be equal to [(neck girth/2)?p cm]/2; determining an armhole dimension L4 to be equal to (arm root girth/2) plus q cm; determining a cover flank dimension L5 to be equal to armhole dimension L4 plus r cm; determining a back cover height L6 to be equal to cover flank dimension L5 plus k cm; and determining a chest cover height L7 to be equal to back cover height L6 plus s cm.