GRADING THE ARM PATTERN
At right are the main pattern pieces for the mannequin arm. The arm pattern which comes from the class in Ann Arbor and the guests who visited Paris, is a size 38.
To grade the pieces; draw a long center perpendicular line for each piece on a fresh piece of pattern paper.
Shift the pattern pieces the indicated amount from center line; nb 4 millimeters up at cap, 3 millimeters at left and at right side at cross cap on large piece and 3 millimeters at left and at right side on corresponding under arm piece,and 2 millimeters at left and at right side at wrist point. These increments grade the pattern by one size.
NOTE:that for the underarm piece you must maintain the platitude of 1.5 centimeters at the curve from the center line toward the concave seam (inside seam) to avoid a peak at underarm.