This document provides an overview of common pattern markings used in commercial sewing patterns. It explains that pattern markings help seamlessly assemble patterns and include information like piece numbers, views, sizes and cutting details. Pre-layout markings include adjustment lines and waistlines. Key layout markings are grainlines, notches and fold lines. Cutting lines define the edge of each pattern piece. Construction markings like seamlines, arrows, dots and hemlines guide the sewing process. Understanding pattern markings makes cutting and sewing patterns easier and more accurate.