Explain uses of size chart for grading ?

A size chart is a tool that is used to grade clothing sizes. It typically includes a set of measurements, such as chest, waist, and hip measurements, that correspond to different sizes. These measurements are used to determine the appropriate size of a garment for a particular individual. For example, a size chart can be used to determine the best size of a shirt for a person based on their chest measurement. Size charts can also be used to grade patterns for clothing, making sure that the final product is accurate and consistent in size. This can be done by using the size chart to adjust the pattern based on the measurements of the intended wearer.