Grading is the process of scaling a garment's measurements from one base size up and down to the full size range. Grade rules set how much each point of measure grows or shrinks from one size to the next, so every size keeps the same fit and proportions as the original.
A pattern is first made and approved in a single base size. Grading then applies a grade rule to each point of measure (POM), such as how much a sleeve should grow between S and M, or how the waistband changes from size to size. The rules can follow industry standards or human anatomy, but they work best when they are specific to each part of the garment. Together with the POMs and tolerances (+/-), the graded values form the style's size specification.
An unclear or inconsistent grade rule does not stay in one size. It is repeated across the whole size range and every supplier, which is how fit problems and extra sample rounds start. Checking several POMs in every size is a simple way to see whether the grading holds. Clear, shared grade rules give design, buying and suppliers one reference for how the full range should measure.
In Delogue, the Size Chart is where measurements and grading are built and reviewed. Teams can add overall comments, attach How to Measure files and choose which information appears on screen, so suppliers work from the same specification as the design team. See how to spec a garment with points of measure.