pattern grading is the transformation of the original sample or base sample size measurements into finer sizes by using a variety of size specification sheets or grades. This is done electronically or manually using various computerized pattern drafting programs. It usually involves conversion from data in the original form (either inches or mm) to a scale that is representative of a specific measurement. Generally, it is used as an illustration in the creation of plans or drawings for architectural or structural structures.

There are different types of pattern grading methods. Some of them are based on the mathematical transpose of a scaled down version of the original data set. Other techniques use the arithmetic mean of two scaled or modified data sets. In some cases, computer numerical analysis (CAD) is applied to determine a standard size range.
Most textile manufacturers follow the Fitting and Grading System for large items such as sweaters, blouses, pants, suits, dresses and other bulk items. This is achieved by taking the original measurements of the garments or blouses and then transforming these values into sizes according to the latest manufacturing standards for garments of the same size range. This is also referred to as garment sizing or standard sizing. These sizes are often used as basis for creating bulk order discounts and wholesale clothing deals.
There are a number of companies that offer this service. They buy all the factory produced sewing patterns, textile fabrics and related materials and transform them into standardized sizes. The transformed sizes are then converted into finished products. These transformed garments or finished samples are then used for different type of pattern grading services, including grading, cut-testing, seam-stitching and quilting cutting.
Apart from garments, clothing or fabric used for making draperies, bedding, pillows, tablecloths, wall hanging, footwear and accessories are also being graded in standardized sizes. These sizes range from one to fourteen. Clothing and draperies can be ordered in any one of these sizes, but patterns for accessories and furniture have to be one of the sizes specified. Hence, for making customized clothes and furniture one needs to order specific one size specific pattern grading so as to avoid mix-ups at the store.
Fabric dye lotions and preservatives are often used for preserving garments. Apart from garments and other fabric, there are other things like accessories and other parts of furniture that need to be graded and rated for customers’ use. This makes it very important for manufacturers to maintain uniformity in sizes and pattern grading. Regular inspection and updating of the records are important for ensuring consistent quality of finished products.