How to mark seam allowances.
Vintage patterns often lacked seam and hem allowances, which actually makes the fitting and adjustment process, such as a full bust adjustment easier, particularly when making a mock-up.
Simply mark the seam lines and add generous seam allowances (30mm/1 inch) to the mock-up fabric, and then pin and mark any necessary adjustments during the fitting phase.
This way, you can accurately transfer the adjustments (adjusted seams and darts) back onto the paper pattern, improving its fit for your project.