In order to draft the basic jacket sloper, the following measurements are needed: 1/2 = chest circumference + 3-1/2” for ease, center front to center back 1/2 = front chest. 1/2 shoulder blade SEE SIZE CHART 1= back neck point 1 to 2 = back waist length (center back) 2 = waist 3 = 1/2 of 1 to 2 4 = chest 3 To 4 = 1- ¾” 1 to 5 = 1/5 of 1 to 4 5 = shoulder guideline Square off from 1, 5, 4, and 2 toward left 4 to 6 = 1/2 front chest + 3-1/2” for ease 6 . . .