Before drafting, you must measure the vertical and horizontal stretch of your fabric. This determines how much to subtract from your base block.
At the bottom of the center front line, square out a horizontal line. This is typically 2.5 cm to 3.5 cm wide for a standard front block. Patternmaking For Underwear Design.pdf
Disclaimer: Always respect copyright. Many excellent books are available for legal purchase or library access. Avoid pirated scans as they often have missing pages or distorted scaling. Before drafting, you must measure the vertical and
Add a seam allowance equal to the width of the elastic flat edge (usually 6mm to 9mm). The elastic is stitched down and then flipped inward. Modern Digital Workflow vs. Traditional Paper Traditional Paper Drafting Digital CAD Drafting Tools Needed Patternmaking For Underwear Design.pdf